市北初级中学2012学年第一学期七年级数学月考试卷

市北初级中学 2012学年第一学期七年级数学月考试卷(考试时间 60分钟满分100分)2012.9题号一二三四总分得分一、选择题 (本大题共有 6题，每题 2分，满分 12分)2,a1,x2221(在代数式3,,,,中是整式的个数是 ()a,b3mn5xA.2(B)3;(C)4;(D)5(235m,2(设某数为m,那么代数式表示 ()2A.某数的3倍的平方减去 5除以2B.某数的3倍减5的一半C.某数与5的差的3倍除以2D.某数平方的3倍与5的差的一半233(将计算的结果写成幕的形式正确的是 ()(x,y)(y,x)(y,x)6665A.B.C.D.((y,x),(x,y),(y,x)(x,y)TOC\o"1-5"\h\z4.以下能用平方差公式的是 ()A.;B.;(2a ，b)(a,2b)(a,b)(b,a)C.;D..(a,b)(,a,b)(a ，b)(,a,b)65(下列四个算式中，结果等于3的是 ()32333，，，， 23332223333，(23)(3)，，， ?;?;?;?2() ，(2)()，,,,,222，，，，A.???B.??C.??D.???6.如图，边长为(m+3)的正方形纸片剪出一个边长为m的正方形之后，剩余部分又剪拼成一个长方形(不重叠无缝隙)，若拼成的长方形一边长为3,则另一边长是•…()A(2m+3;B.2m+6;C.m+3;D.m+6.二、填空题(本大题共有12题，每题3分，满分36分)2x,3x,2x,17(当时，代数式=.x,3abx8(是一个五次单项式，则=.142班级姓名学号xy,3xy,29.代数式是次项式.3装订线meettheconstructiondrawingsprovidedstrengthandworkabilityofconstructionrequirements,mixingratiomustbedeterminedbytest.Constructionwhenyouneedtochangethemixofcementitiousmaterial,retesting,andsubmittedtothesupervisorforapproval.(2)mixingofcementitiousmaterials,shouldbecarriedoutstrictlyaccordingtothetesttodeterminetheingredientsofingredients,notampering,ingredientweighingerrorsshouldbeallowedsubjecttothefollowing:cement?2%;sand,gravelis?3%,water,additives?1%.(3)thecementitiousmaterialinthemixingprocessshouldremainofcoarseandfineaggregatewaterstability,accordingtochangesinmoisturecontentofaggregateandadjustwatertoensuretheaccuracyofthewater/cementratio.(4)mixingtimeofcementitiousmaterials:mechanicalmixingofnotlessthan2~3min,notartificialmix.Localsmallartificialmixtureofdrymixatleastthreetimes,thenwet-mixtouniformcolor,canbeused.(5)withcementitiousmaterialsshouldbemixed.Cementitiousmaterialsallowedintervalshouldbedeterminedthroughexperiments,orrefertothetableselected.Segregationduringtransportandstorage,watermortarandmasonrybeforemixingagain,initialsettingofcementitiousmaterialsshallnotbeused.Cementitiousmaterialsallowbreakswhenlayingtemperature(?)allowedinterval(min),ordinaryPortlandcementandslagPortlandcement20~309012010~201351805~10195/8.4.5andpozzolanacementmasonrymasonrywithPucastingmethod,theprocessis:masonrypreparationmaterialselection?putspulpplacedstone?...8.58.5.1masonrymortarforconstructionofmasonrysandinthesand,andsiftthesandshallnotincludegrass-rootsandotherdebris.Sandclaydoesnotexceed5%.Mixingofmortar350Lmortarmixer.Mixingtime,finishedfeeding,andshallnotbelessthan1.5min,thebatchingprocess,cementbatchingerrorcontrolwithin?5%.Mortarmixusedcementmortarusedintheblendedinto3h,suchasatemperatureofover30?cduringtheconstructionperiod,within2Hoftheblendedintofinished,suchasthephenomenonofcementmortar,mixagaininfrontofthebuilding.8.5.2brickmaterialaccordingtothedesignrequirements,usingprecastconcretehollowbrick,sourcedlocally.Brickgamesontothesite,withthesupervisionandsamplingpersonnelofpartyarandomsampling,compressiontest,qualifiedbeforethemasonry.8.5.3masonry(1)waterwetpriortobrickandmasonry,andmoisturecontrolin10~10%,nondriedbricksonthewall.(2)accordingtotheaxisofthewallsofthebrickwallswherethepop-upandthesideline,bricks,buildthefirstpendulum,fromthemortarjointwidthwhenlaidbrick,payattentiontowindowlocationeffectofmortarjoint.Sevenseparatemasonry2324410（把多项式按字母的升幂排列 x6xy,2xy,5xy，3y,4x是.122m，n,1311（单项式与是同类项，则 .,xymn,xy212（计算:.（x，2）（x,8）,20121,,201213（计算:=.，， ,，,2,,2,,214（若，则= .x，y，， x,2，y，1,0a,b,ab,a,bb15（现规定一种运算，其中，为实数，则.,,ab,a,a,16（代数式x+2y的值是 3，则代数式 2x+4y+1的值为 .2nn,3nmn17（E知，则5=.（用含a、b的式子表示）5a5,b218（若多项式 x,mx，64是一个完全平方式，则 m=.三、简答题 （本题共有 6小题，每小题 5分，满分 30分）543232219（计算 :;20（计算:;，，4ab,，，,3ab，2ab，，，， a,a221（计算 :;22（计算:;，，，， 1，2a,3b3a,b，，，， 5x,xx,2y,y2x,3y22，，，， 23（计算:;24.计算:a,2b，ca，2b,c.，，，， 2x,3y2x，3y四、解答题 :（本大题共有 4题，第 25、26每题5分，第 27、28每题6分，满分22分）meettheconstructiondrawingsprovidedstrengthandworkabilityofconstructionrequirements,mixingratiomustbedeterminedbytest.Constructionwhenyouneedtochangethemixofcementitiousmaterial,retesting,andsubmittedtothesupervisorforapproval.（2）mixingofcementitiousmaterials,shouldbecarriedoutstrictlyaccordingtothetesttodeterminetheingredientsofingredients,notampering,ingredientweighingerrorsshouldbeallowedsubjecttothefollowing:cement?2%;sand,gravelis?3%,water,additives?1%.（3）thecementitiousmaterialinthemixingprocessshouldremainofcoarseandfineaggregatewaterstability,accordingtochangesinmoisturecontentofaggregateandadjustwatertoensuretheaccuracyofthewater/cementratio.(4)mixingtimeofcementitiousmaterials:mechanicalmixingofnotlessthan2~3min,notartificialmix.Localsmallartificialmixtureofdrymixatleastthreetimes,thenwet-mixtouniformcolor,canbeused.(5)withcementitiousmaterialsshouldbemixed.Cementitiousmaterialsallowedintervalshouldbedeterminedthroughexperiments,orrefertothetableselected.Segregationduringtransportandstorage,watermortarandmasonrybeforemixingagain,initialsettingofcementitiousmaterialsshallnotbeused.Cementitiousmaterialsallowbreakswhenlayingtemperature(?)allowedinterval(min),ordinaryPortlandcementandslagPortlandcement20~309012010~201351805~10195/8.4.5andpozzolanacementmasonrymasonrywithPucastingmethod,theprocessis:masonrypreparationmaterialselection?putspulpplacedstone?...8.58.5.1masonrymortarforconstructionofmasonrysandinthesand,andsiftthesandshallnotincludegrass-rootsandotherdebris.Sandclaydoesnotexceed5%.Mixingofmortar350Lmortarmixer.Mixingtime,finishedfeeding,andshallnotbelessthan1.5min,thebatchingprocess,cementbatchingerrorcontrolwithin?5%.Mortarmixusedcementmortarusedintheblendedinto3h,suchasatemperatureofover30?cduringtheconstructionperiod,within2Hoftheblendedintofinished,suchasthephenomenonofcementmortar,mixagaininfrontofthebuilding.8.5.2brickmaterialaccordingtothedesignrequirements,usingprecastconcretehollowbrick,sourcedlocally.Brickgamesontothesite,withthesupervisionandsamplingpersonnelofpartyarandomsampling,compressiontest,qualifiedbeforethemasonry.8.5.3masonry(1)waterwetpriortobrickandmasonry,andmoisturecontrolin10~10%,nondriedbricksonthewall.(2)accordingtotheaxisofthewallsofthebrickwallswherethepop-upandthesideline,bricks,buildthefirstpendulum,fromthemortarjointwidthwhenlaidbrick,payattentiontowindowlocationeffectofmortarjoint.Sevenseparatemasonry232325.已知:A,3x,2x,1,B,3x,2x,1,C,2x,1(求当时，2A,2B,3c的值(x,3TOC\o"1-5"\h\z26(如图，一个零件的平面图由一个半圆和一个长方形所组成 ((1)用a表示所给图形面积 ;(2)当a,2cm,求这个图形的面积(兀取3.14)(2aa27(中国是举世闻名的瓷器之乡，周末小明陪爸爸去陶瓷商城购买一些茶壶和茶杯，了解情况后发现甲、乙两家商店都在出售两种同样品牌的茶壶和茶杯，定价相同 :茶壶每把定价40元，茶杯每只定价 8元，且两家都有优惠 :甲店买一送一大酬宾 :(即买一把茶壶赠送茶杯一只 );乙店全场 9折优惠。小明爸爸需茶壶 5把，茶杯只 (不少于5只)。x(1)若只在一家店购买所需茶壶和茶杯，则在甲店购买需付 元;在乙店购买需付 元。(用含x的代数式表示并化简。 )x,15(2)当时，请你帮小明爸爸设计最省钱的购买方案 ,并说明理由 .28(探索研究 :meettheconstructiondrawingsprovidedstrengthandworkabilityofconstructionrequirements,mixingratiomustbedetermined 市北初级中学2012学年第一学期七年级数学试卷 bytest.Constructionwhenyouneedtochangethemixofcementitiousmaterial,retesting,andsubmittedtothesupervisorfor第3页共8页approval.(2)mixingofcementitiousmaterials,shouldbecarriedoutstrictlyaccordingtothetesttodeterminetheingredientsofingredients,notampering,ingredientweighingerrorsshouldbeallowedsubjecttothefollowing:cement?2%;sand,gravelis?3%,water,additives?1%.(3)thecementitiousmaterialinthemixingprocessshouldremainofcoarseandfineaggregatewaterstability,accordingtochangesinmoisturecontentofaggregateandadjustwatertoensuretheaccuracyofthewater/cementratio.(4)mixingtimeofcementitiousmaterials:mechanicalmixingofnotlessthan2~3min,notartificialmix.Localsmallartificialmixtureofdrymixatleastthreetimes,thenwet-mixtouniformcolor,canbeused.(5)withcementitiousmaterialsshouldbemixed.Cementitiousmaterialsallowedintervalshouldbedeterminedthroughexperiments,orrefertothetableselected.Segregationduringtransportandstorage,watermortarandmasonrybeforemixingagain,initialsettingofcementitiousmaterialsshallnotbeused.Cementitiousmaterialsallowbreakswhenlayingtemperature(?)allowedinterval(min),ordinaryPortlandcementandslagPortlandcement20~309012010~201351805~10195/8.4.5andpozzolanacementmasonrymasonrywithPucastingmethod,theprocessis:masonrypreparation -materialselection?putspulpplacedstone?...8.58.5.1masonrymortarforconstructionofmasonrysandinthesand,andsiftthesandshallnotincludegrass-rootsandotherdebris.Sandclaydoesnotexceed5%.Mixingofmortar350Lmortarmixer.Mixingtime,finishedfeeding,andshallnotbelessthan1.5min,thebatchingprocess,cementbatchingerrorcontrolwithin?5%.Mortarmixusedcementmortarusedintheblendedinto3h,suchasatemperatureofover30?cduringtheconstructionperiod,within2Hoftheblendedintofinished,suchasthephenomenonofcementmortar,mixagaininfrontofthebuilding.8.5.2brickmaterialaccordingtothedesignrequirements,usingprecastconcretehollowbrick,sourcedlocally.Brickgamesontothesite,withthesupervisionandsamplingpersonnelofpartyarandomsampling,compressiontest,qualifiedbeforethemasonry.8.5.3masonry(1)waterwetpriortobrickandmasonry,andmoisturecontrolin10~10%,nondriedbricksonthewall.(2)accordingtotheaxisofthewallsofthebrickwallswherethepop-upandthesideline,bricks,buildthefirstpendulum,fromthemortarjointwidthwhenlaidbrick,payattentiontowindowlocationeffectofmortarjoint.Sevenseparatemasonry(1)观察一列数2,4,8,16,32,…，发现从第二项开始，每一项与前一项之比是一个常数，这个常数是 ;根据此规律，如果 (为正整数)表示这个数列的第annn项，那么 ， ;a,a,n72342023420(2)如果欲求的值，可令 1，3，3，3，3，？， 3s,1，3，3，3，3，？， 3?23421将 ?式两边同乘以 3，得 :?,由 ?减去 ?式，得 3s,3，3， 3， 3，？， 3(s,(3)用由特殊到一般的方法知：若数列，，，…，，从第二项开始每一项与aaaa3n12前一项之比的常数为，则 (用含，，的代数式表示 )，如qqa,ann1果这个常数，那么 (用含，，的代数式 qa，a，a，？ a,anq,1123n1表示)(市北初级中学 2012学年第一学期七年级数学月考试卷 meettheconstructiondrawingsprovidedstrengthandworkabilityofconstructionrequirements,mixingratiomustbedeterminedbytest.Constructionwhenyouneedtochangethemixofcementitiousmaterial,retesting,andsubmittedtothesupervisorforapproval.(2)mixingofcementitiousmaterials,shouldbecarriedoutstrictlyaccordingtothetesttodeterminetheingredientsofingredients,notampering,ingredientweighingerrorsshouldbeallowedsubjecttothefollowing:cement?2%;sand,gravelis?3%,water,additives?1%.(3)thecementitiousmaterialinthemixingprocessshouldremainofcoarseandfineaggregatewaterstability,accordingtochangesinmoisturecontentofaggregateandadjustwatertoensuretheaccuracyofthewater/cementratio.(4)mixingtimeofcementitiousmaterials:mechanicalmixingofnotlessthan2~3min,notartificialmix.Localsmallartificialmixtureofdrymixatleastthreetimes,thenwet-mixtouniformcolor,canbeused.(5)withcementitiousmaterialsshouldbemixed.Cementitiousmaterialsallowedintervalshouldbedeterminedthroughexperiments,orrefertothetableselected.Segregationduringtransportandstorage,watermortarandmasonrybeforemixingagain,initialsettingofcementitiousmaterialsshallnotbeused.Cementitiousmaterialsallowbreakswhenlayingtemperature(?)allowedinterval(min),ordinaryPortlandcementandslagPortlandcement20~309012010~201351805~10195/8.4.5andpozzolanacementmasonrymasonrywithPucastingmethod,theprocessis:masonrypreparation -materialselection?putspulpplacedstone?...8.58.5.1masonrymortarforconstructionofmasonrysandinthesand,andsiftthesandshallnotincludegrass-rootsandotherdebris.Sandclaydoesnotexceed5%.Mixingofmortar350Lmortarmixer.Mixingtime,finishedfeeding,andshallnotbelessthan1.5min,thebatchingprocess,cementbatchingerrorcontrolwithin?5%.Mortarmixusedcementmortarusedintheblendedinto3h,suchasatemperatureofover30?cduringtheconstructionperiod,within2Hoftheblendedintofinished,suchasthephenomenonofcementmortar,mixagaininfrontofthebuilding.8.5.2brickmaterialaccordingtothedesignrequirements,usingprecastconcretehollowbrick,sourcedlocally.Brickgamesontothesite,withthesupervisionandsamplingpersonnelofpartyarandomsampling,compressiontest,qualifiedbeforethemasonry.8.5.3masonry(1)waterwetpriortobrickandmasonry,andmoisturecontrolin10~10%,nondriedbricksonthewall.(2)accordingtotheaxisofthewallsofthebrickwallswherethepop-upandthesideline,bricks,buildthefirstpendulum,fromthemortarjointwidthwhenlaidbrick,payattentiontowindowlocationeffectofmortarjoint.Sevenseparatemasonry班级姓名学号装订线答案一、选择题 (本大题共有 6题，每题 2分，满分 12分)2,a1,x2221(在代数式3,,,,中是整式的个数是 (C)a,b3mn5xA.2(B)3;(C)4;(D)5(235m,2(设某数为m,那么代数式表示 (D)2A.某数的3倍的平方减去 5除以2B.某数的3倍减5的一半C.某数与5的差的3倍除以2D.某数平方的3倍与5的差的一半233(将计算的结果写成幕的形式正确的是 (A)(x,y)(y,x )(y,x)6665A.B.C.D.((y,x)(x,y),(x,y),(y,x)4.以下能用平方差公式的是 (C)A.;B.;(2a ，b)(a,2b)(a,b)(b,a)C.;D..(a,b)(,a,b)(a ，b)(,a,b)6(下列四个算式中，结果等于的是 (D)5332333，，，， 23332223333，?;?(23)(3) ，，， ;?;?2()，(2)()，,,,,222，，，，A.???B.??C.??D.???6.如图，边长为（m+3）的正方形纸片剪出一个边长为m的正方形之后，剩余部分又剪拼成一个长方形 （不重叠无缝隙），若拼成的长方形一边长为3,则另一边长是•…（A）二、填空题（本大题共有12题，每题3分，满分36分）2x,3x,2x,17（当时，代数式=14.x,3abx8（是一个五次单项式，=4.142xy,3xy,29.代数式是五次三项式.323244x10（把多项式按字母的开幕排列是6xy,2xy,5xy,3y,4x42324.3y,2xy,6xy,5xy,4xmeettheconstructiondrawingsprovidedstrengthandworkabilityofconstructionrequirements,mixingratiomustbedetermined 市北初级中学2012学年第一学期七年级数学试卷 bytest.Constructionwhenyouneedtochangethemixofcementitiousmaterial,retesting,andsubmittedtothesupervisorfor第5页共8页approval.（2）mixingofcementitiousmaterials,shouldbecarriedoutstrictlyaccordingtothetesttodeterminetheingredientsofingredients,notampering,ingredientweighingerrorsshouldbeallowedsubjecttothefollowing:cement?2%;sand,gravelis?3%,water,additives?1%.（3）thecementitiousmaterialinthemixingprocessshouldremainofcoarseandfineaggregatewaterstability,accordingtochangesinmoisturecontentofaggregateandadjustwatertoensuretheaccuracyofthewater/cementratio.(4)mixingtimeofcementitiousmaterials:mechanicalmixingofnotlessthan2~3min,notartificialmix.Localsmallartificialmixtureofdrymixatleastthreetimes,thenwet-mixtouniformcolor,canbeused.(5)withcementitiousmaterialsshouldbemixed.Cementitiousmaterialsallowedintervalshouldbedeterminedthroughexperiments,orrefertothetableselected.Segregationduringtransportandstorage,watermortarandmasonrybeforemixingagain,initialsettingofcementitiousmaterialsshallnotbeused.Cementitiousmaterialsallowbreakswhenlayingtemperature(?)allowedinterval(min),ordinaryPortlandcementandslagPortlandcement20~309012010~201351805~10195/8.4.5andpozzolanacementmasonrymasonrywithPucastingmethod,theprocessis:masonrypreparation -materialselection?putspulpplacedstone?...8.58.5.1masonrymortarforconstructionofmasonrysandinthesand,andsiftthesandshallnotincludegrass-rootsandotherdebris.Sandclaydoesnotexceed5%.Mixingofmortar350Lmortarmixer.Mixingtime,finishedfeeding,andshallnotbelessthan1.5min,thebatchingprocess,cementbatchingerrorcontrolwithin?5%.Mortarmixusedcementmortarusedintheblendedinto3h,suchasatemperatureofover30?cduringtheconstructionperiod,within2Hoftheblendedintofinished,suchasthephenomenonofcementmortar,mixagaininfrontofthebuilding.8.5.2brickmaterialaccordingtothedesignrequirements,usingprecastconcretehollowbrick,sourcedlocally.Brickgamesontothesite,withthesupervisionandsamplingpersonnelofpartyarandomsampling,compressiontest,qualifiedbeforethemasonry.8.5.3masonry(1)waterwetpriortobrickandmasonry,andmoisturecontrolin10~10%,nondriedbricksonthewall.(2)accordingtotheaxisofthewallsofthebrickwallswherethepop-upandthesideline,bricks,buildthefirstpendulum,fromthemortarjointwidthwhenlaidbrick,payattentiontowindowlocationeffectofmortarjoint.Sevenseparatemasonry122m，n,1311(单项式与是同类项，则 3.,xymn,xy2212(计算 :.x,6x,16(x ，2)(x,8),20121,,201213(计算:=1. ，， ,，,2,,2,,214(若，则 =___1 .x，y，， x,2，y，1,0a,b,ab,a,bb15(现规定一种运算，其中，为实数，则,,ab,a,a,2.ab,a，b16(代数式x+2y的值是3,则代数式2x+4y+1的值为7.2m,3n23mn17也知,WJ=.(用含a、b的式子表示)5ab5a5,b2,1618(若多项式 x,mx，64是一个完全平方式，则 m=.三、简答题 (本题共有 6小题，每小题 5分，满分 30分)543232219(计算 :;20(计算:;，，4ab,，，,3ab，2ab，，，， a,a10123333a,a,,12ab,8ab解：原式=……4分解：原式•••4分2233a,4ab……1分(……1分221(计算 :;22(计算:;，，，， 1，2a,3b3a,b，，，， 5x,xx,2y,y2x,3y222解：原式•••3分解:原式,5x,x,2xy,2xy,3y2222,3a,b,6a,2ab,9ab,3b(…？分(3分,4x,3y22,6a,11ab,3a,3b,b(……2分22计算:，，，， 23(;24.计算:a,2b，ca，2b,c.，，，， 2x,3y2x，3y2,,,,解:原式(2分解:原式,a,(2b,c)a，(2b,c)(2分，，，， ,,,2x,3y2x，3y22222=(1分(2分,a,(2b,c) ，， 4x,9y2224224,a,4b,4bc,c=…1分……1分16x,72xy,81y四、解答题 :(本大题共有 4题，第25、26每题5分，第 27、28每题6分，满分22分)meettheconstructiondrawingsprovidedstrengthandworkabilityofconstructionrequirements,mixingratiomustbedeterminedbytest.Constructionwhenyouneedtochangethemixofcementitiousmaterial,retesting,andsubmittedtothesupervisorforapproval.(2)mixingofcementitiousmaterials,shouldbecarriedoutstrictlyaccordingtothetesttodeterminetheingredientsofingredients,notampering,ingredientweighingerrorsshouldbeallowedsubjecttothefollowing:cement?2%;sand,gravelis?3%,water,additives?1%.(3)thecementitiousmaterialinthemixingprocessshouldremainofcoarseandfineaggregatewaterstability,accordingtochangesinmoisturecontentofaggregateandadjustwatertoensuretheaccuracyofthewater/cementratio.(4)mixingtimeofcementitiousmaterials:mechanicalmixingofnotlessthan2~3min,notartificialmix.Localsmallartificialmixtureofdrymixatleastthreetimes,thenwet-mixtouniformcolor,canbeused.(5)withcementitiousmaterialsshouldbemixed.Cementitiousmaterialsallowedintervalshouldbedeterminedthroughexperiments,orrefertothetableselected.Segregationduringtransportandstorage,watermortarandmasonrybeforemixingagain,initialsettingofcementitiousmaterialsshallnotbeused.Cementitiousmaterialsallowbreakswhenlayingtemperature(?)allowedinterval(min),ordinaryPortlandcementandslagPortlandcement20~309012010~201351805~10195/8.4.5andpozzolanacementmasonrymasonrywithPucastingmethod,theprocessis:masonrypreparation -materialselection?putspulpplacedstone?...8.58.5.1masonrymortarforconstructionofmasonrysandinthesand,andsiftthesandshallnotincludegrass-rootsandotherdebris.Sandclaydoesnotexceed5%.Mixingofmortar350Lmortarmixer.Mixingtime,finishedfeeding,andshallnotbelessthan1.5min,thebatchingprocess,cementbatchingerrorcontrolwithin?5%.Mortarmixusedcementmortarusedintheblendedinto3h,suchasatemperatureofover30?cduringtheconstructionperiod,within2Hoftheblendedintofinished,suchasthephenomenonofcementmortar,mixagaininfrontofthebuilding.8.5.2brickmaterialaccordingtothedesignrequirements,usingprecastconcretehollowbrick,sourcedlocally.Brickgamesontothesite,withthesupervisionandsamplingpersonnelofpartyarandomsampling,compressiontest,qualifiedbeforethemasonry.8.5.3masonry(1)waterwetpriortobrickandmasonry,andmoisturecontrolin10~10%,nondriedbricksonthewall.(2)accordingtotheaxisofthewallsofthebrickwallswherethepop-upandthesideline,bricks,buildthefirstpendulum,fromthemortarjointwidthwhenlaidbrick,payattentiontowindowlocationeffectofmortarjoint.Sevenseparatemasonry232325.已知:A,3x,2x,1,B,3x,2x,1,C,2x,1（求当时，2A2B,3c的值（x,3解:2A，2B,3c323,2（3x,2x，1），2（3x，2x,1）,3（2x，1）3分323,6x,4x，2，6x，4x,2,6x,32,6x,31分2212,,当时，原式 =1分x,63，,,,,,333,,26（如图，一个零件的平面图由一个半圆和一个长方形所组成 （（1）用a表示所给图形面积 ;（2）当a,2cm,求这个图形的面积（兀取3.14）（2aa1,22解:（1）S,2a,a,a,（2，）a3分,223.14,22（2）S,（2，）a,（2，），2,14.282分2227（中国是举世闻名的瓷器之乡，周末小明陪爸爸去陶瓷商城购买一些茶壶和茶杯，了解情况后发现甲、乙两家商店都在出售两种同样品牌的茶壶和茶杯，定价相同:茶壶每把定价 40元，茶杯每只定价 8元，且两家都有优惠 :甲店买一送一大酬宾:（即买一把茶壶赠送茶杯一只 ）;乙店全场 9折优惠。小明爸爸需茶壶 5把，茶杯只（不少于5只）。x（1）若只在一家店购买所需茶壶和茶杯，则在甲店购买需付 元;在乙店TOC\o"1-5"\h\z购买需付 元。（用含x的代数式表示并化简。 ）x,15（2）当时，请你帮小明爸爸设计最省钱的购买方案 ,并说明理由 .160,8x180,7.2x27（解：⑴； 2分160,8,15（2）若只在甲店买需付二280（元） 1分180,7.2,15若只在乙店买需付二288（元）（ 1分若在甲店买茶壶、乙店买剩余的 10个茶杯需付 :200,7.2,10,272 1分所以：在甲店买茶壶、乙店买剩余的10个茶杯最合算。…1分28(探索研究：(1)观察一列数2,4,8,16,32,…，发现从第二项开始，每一项与前一项之比是一个ann常数，这个常数是 ;根据此规律，如果 (为正整数)表示这个数列的第 na,项，那么 ，;a,n7234201，3，3，3，3，？， 3(2)如果欲求的值，23420s,1，3，3，3，3，？， 3可令?meettheconstructiondrawingsprovidedstrengthandworkabilityofconstructionrequirements,mixingratiomustbedetermined 市北初级中学2012学年第一学期七年级数学试卷 bytest.Constructionwhenyouneedtochangethemixofcementitiousmaterial,retesting,andsubmittedtothesupervisorfor第7页共8页approval.(2)mixingofcementitiousmaterials,shouldbecarriedoutstrictlyaccordingtothetesttodeterminetheingredientsofingredients,notampering,ingredientweighingerrorsshouldbeallowedsubjecttothefollowing:cement?2%;sand,gravelis?3%,water,additives?1%.(3)thecementitiousmaterialinthemixingprocessshouldremainofcoarseandfineaggregatewaterstability,accordingtochangesinmoisturecontentofaggregateandadjustwatertoensuretheaccuracyofthewater/cementratio.(4)mixingtimeofcementitiousmaterials:mechanicalmixingofnotlessthan2~3min,notartificialmix.Localsmallartificialmixtureofdrymixatleastthreetimes,thenwet-mixtouniformcolor,canbeused.(5)withcementitiousmaterialsshouldbemixed.Cementitiousmaterialsallowedintervalshouldbedeterminedthroughexperiments,orrefertothetableselected.Segregationduringtransportandstorage,watermortarandmasonrybeforemixingagain,initialsettingofcementitiousmaterialsshallnotbeused.Cementitiousmaterialsallowbreakswhenlayingtemperature(?)allowedinterval(min),ordinaryPortlandcementandslagPortlandcement20~309012010~201351805~10195/8.4.5andpozzolanacementmasonrymasonrywithPucastingmethod,theprocessis:masonrypreparation -materialselection?putspulpplacedstone?...8.58.5.1masonrymortarforconstructionofmasonrysandinthesand,andsiftthesandshallnotincludegrass-rootsandotherdebris.Sandclaydoesnotexceed5%.Mixingofmortar350Lmortarmixer.Mixingtime,finishedfeeding,andshallnotbelessthan1.5min,thebatchingprocess,cementbatchingerrorcontrolwithin?5%.Mortarmixusedcementmortarusedintheblendedinto3h,suchasatemperatureofover30?cduringtheconstructionperiod,within2Hoftheblendedintofinished,suchasthephenomenonofcementmortar,mixagaininfrontofthebuilding.8.5.2brickmaterialaccordingtothedesignrequirements,usingprecastconcretehollowbrick,sourcedlocally.Brickgamesontothesite,withthesupervisionandsamplingpersonnelofpartyarandomsampling,compressiontest,qualifiedbeforethemasonry.8.5.3masonry(1)waterwetpriortobrickandmasonry,andmoisturecontrolin10~10%,nondriedbricksonthewall.(2)accordingtotheaxisofthewallsofthebrickwallswherethepop-upandthesideline,bricks,buildthefirstpendulum,fromthemortarjointwidthwhenlaidbrick,payattentiontowindowlocationeffectofmortarjoint.Sevenseparatemasonry23421将?式两边同乘以 3，得 :?,3s,3 ，3，3，3，？， 3由?减去 ?式，得 (s,(3)用由特殊到一般的方法知：若数列，，，…，，从第二项开始每一项与aaaa3n12前一项之比的常数为，则 (用含，，的代数式表示 )，如qqa,ann1果这个常数，那么 (用含，，的代数式 qa，a，a，？ a,anq,1123n1表示)(7n28(解:(1)2 1分； 1 分； 1 分2221,31(2) 1分2n,1(3) 1 分aq1nna(1,q)a(q,1)11，或 1分1,qq,1meettheconstructiondrawingsprovideds