2022-2023学年北京市东城区东直门中学九年级(上)期中数学试卷_第1页
2022-2023学年北京市东城区东直门中学九年级(上)期中数学试卷_第2页
2022-2023学年北京市东城区东直门中学九年级(上)期中数学试卷_第3页
2022-2023学年北京市东城区东直门中学九年级(上)期中数学试卷_第4页
2022-2023学年北京市东城区东直门中学九年级(上)期中数学试卷_第5页
已阅读5页,还剩29页未读 继续免费阅读

下载本文档

版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领

文档简介

2022-2023+(±)

1.(3#)TJiJTO^^mTOâ^()

2.(3fr)$nS»ÆAABC41,D,EfâtiftfttfEÿlAB,AC±,DE//BC.%DE:BC=3:

4,ÜWSAADE-.S^ABCJ'J()

A

A.3:4B.4:3C.9:16D.16:9

3.(3A(1,yi),B(-4,yz)IfPiÉE—y=-.r+3fflfl-h.»WÜyi.yz^C

()

A.yi>y2B.yi<y2C.yi=y2D.

4.(35>)xô<j~7üz:?^fg?+6A--a=0WM^^ffl^iï<J^»,J!h®ŒE

£()

A.a>-9B.a<-9C.-9D.-9

5.(3#)M,ABztOûMfé.CD^ZBAD=24°,P'iJZC()

A.24°B.56°C.66°D.76°

6.(3^>)M,ÆAABC41.AB=AC^5,BC=8,!UA2K®,T

A.âB'{i:.Q>AAlB.*CÆOA±

C.D.OfiC^OAffig

7.(35»M,&MPNP'N’,K!|

W«1()

A.*AB.&BC.ÆCD.Æ.D

8.(35»M,ÆAABC^,ZC=90°,AC=5,BC=10.M,/VftftMkA,CM

ÆIWtB&£MAffWOACfàtiCIAW17rÆN/A

CCB[R]ÆBIAW2iâisiWlH]t,M,CZl's]

ÔÙ£ËM^y,/XMCNs,%'ly-^t.()

A.lEkt«lfc&M,

B.iEttÆIM^,

C.—

D.—

A,

9.(35»^(-1--3).

10.(35»Av-12=0âÙ-W^2,KÜA:Û<J<^.

11.(35»©ffUfàT;y

AJ(o,3).^z/Aa^â<jmA-3AnnAê

12.(3#)

*iJJWWfftWzRWFrWmS.7»Wltffl

miH1WÂBK2X,£»T.*ÈlWléBC^lX.fâj-B^J,llrWfW

&EF&JÏ)19*.iW^W^MmMî±!^¥^W^DE^^*.

13.(35>)M,EABCDl*lfô—A,AAEBBfèWKf90°1H/OJA

CFB,'-&^EF,^A.E.FH^ÆIHJ-O$±,WZAEB.

14.(3ÿÉ^ay=ax2+bx+cWJ^Tx

ax2+bx+c=0_________________

15.(3^-)ftlIS,PA,PB^QOm^,AC&Ç)0ftlg.^ZP

=60“,PA=6,{QUBCË1K?9•

16.(35>)£u[?l,AE,BFflflUABM'&iïj

c.B&lA(-b0),B(1,0),AE//BF,.y$rtl

«DAEâù^ini«^±,wy=x+bwm^mcWRW-®

17.

(1)X2-9=0;

(2)A8X+1=0.

18.B&—A(-1,0),B(3,0)flIC(0,3)=£,5jUt—&

19.M,AB>O(?M&,fôCD-LAB,SÆ^lE,WAB=20,C£)=16.^AE^jfl:.

20.TM<hfflii£i+fô

Bfei:(W1).

OP,

iflü:£nS2,

®ÆM/±WM£A,B-,

®^5J|J^,^A,AP,BP^

Q-,

®\^^.PQ,S^M/T^C;

®iuâP7'J0-Ù',PCâ'Jfl:>j¥-®iaiOP.

WOPBlJMJr^.

OH'Mi+MWfflftg,

(1)(«SftfflOD;

(2)^TSWîO.

iïEHJJ:JÎfêÂP,AQ,BP,BQ.

\‘AP=,BP=

:.&A,B«PQm™±.

:.mAB&&&PQ

’.'PQLl,PC^QPfà^-fe,

.'.QPW/O()(WÈSiftfôig).

I

S1

p

~A~1

S2

21.~.y=.r-2x-3

(1)

(2)

X

y

(3)â-2^<2nt,yiWifëffl.

'Si

’^OffW^‘4411=30‘£=VO%(2)

WÊOHÉ‘^¥SWoEÊrOff(i)

017=03K‘3^±^g|O0‘UV‘C10TV0‘^O^dV‘®D$’tZ

(Z)

:W(i)

•0=I-Ui+xui-_x□£-(#-V-£3

(Z)

OlffVV^SfM^fR®‘o06W44â»Vï?3g3tfVW(I)

%W^WM9^EiW’zz

«î±!xSEifeWWSJt^yX.«WWiJ«®:

x/%012344.4

yl%2.53.33.32.50.90

'hffctëîg^ÂlMW^,»y&xWM,##yBSxW»tW£4tW^#ÆfTT

TM'h^W^ilO,

(1)xOy+,tôWWOftSWÆ(x,y),#0HjMW

m;

(2)Éë-ê-MSM,tB7Knfil±tkffiWiW®>9^,

WzWE&W^

œ^lW^zMÈ^fé^jS#,^TffizKti^tfe^Æ'MrtKWzKîHiJàzKYfiEK^^i11.5

X,^RWzKWM,MM,

(«“5T®”“«”)*(OWWHfc).

26.Æ¥®MÆ^^xOy>f>,(1,m),(3,n)StlÉ^âêy=ax*+bx+c(a<0)±,®

ÿÉ«W^W^Max=r

(1)^c=-3,r=2Bt,nÛWbi%M;

(2)(xo,m)r±M^.k,K2<xo<3,^zWW^ffl,n,cftWb

27.BfcL£OJO^ABW4>Æ,é

SÆMMcfli£D.

(1)$□ffl1,PWfi-ê-H'î,MWttiOCWOD;

(2)ftlS2,âP^^AB

ocfnODm

(3)£nS3,^ZCOD=60°,BD.OCZlWjW^Z

28.WOC‘^OC±.--£A,Pi^Æ:APJgOC#MQ,MPA=2(2A,

JOâPA^T0CÈù“fêffiÆ”,xOy*,Ë.A|W£(2,

0).

(1)M1,&OQO2,*P>^,«SA^T0Ow“fèSËâ”.

(DgÆPaxttâ<]ft¥$ȱ,S^WtB*P;

&ZPAO=A5°,

(2)TCt,0),WTA1<:>9¥®^0T,y=-x+4OJ-^xy

*D.E,y=-x+4±#Æ,^P,fêf#PAQT|'|<J“fôSË*”,

tWWZflÿÈH.

2022-2023(±)

1.(35)-)()

fô%5fâ*M141fiûASHI<nqfôrf!,üx^g.

rw^JW:MA.C.mo»fiWA.180°js^

MBi8o°

4>'ùôO®^.

M:B.

2.(35)-)$1114],ÆAABC41,D,E^^M\^.ÿlAB,AC±,DE//BC.%DE-.BC=3-,

4,mûSûADE:S/ABC^'J()

A

A.3:4B.4:3C.9:16D.16:9

J

[W]ÉD£//BCnTWHIAAP£-AABC,nJ^tHSMDE-.S

AABCWH.

(W^lW:’.’DE//BC,

.'.^ADE^/XABC,

S

.AADE(DE)2=9

SAABCBC16

C.

[âiT-1TWOWJÊW,$uW:Â=OW[MHt^TSIM

3.(35»BfcljSA(1,yi),B(-4,y2>Wy=-?+3®^±,Rljyi,yi±

()

A.yi>y2B.yi<y2C.yi=y2D.ÆviïftÆ

[5HJrl

mf.

[«?£]W:Vy=-?+3,

.'.MtWJFDfàT»^W^Mx=o,

.'.âx>0H't,yPIA-if^WMzb.

VA(-4,y2)(4,y2)^fOx=0O,KO<1<4,

•‘•yi>y2.

i&iifc:A.

4.(35»AÉPj---7CA/5C7j^?+6A--«=0^ri^^A<ffl^irj'î)<^m.

<()

A.a>-9B.a<-9C.a^-9D.a^-9

[5Hiïl=62+4«>o,

[fW^lW-:A=6~+4a>0,

ma>-9.

i&iâ:A.

(âWl--7EA&Wax2+bx+c^0(a^O)A=b2-4ac

WftlT^M:^A>0ltf,âA=0ltf,

^A<0W,

5.(3^)^ffl,ABêO<9Kfi^,CD^OOW®.^ABAD=24o,RlJZC()

B

I/Q

I/7

A

A.24°B.56°C.66°D.76°

[#tJrJÈABMOOMféW£lJZA£>B=90q,MM^WSÜZB

[iw^W:vAB^oowa®,

.’.ZADB=90°,

AZB=90°-ZBAD=9Q°-24°=66°,

.’.ZC=ZB=66°.

C.

[ÆlTl

^TO>WWÛ<J1H1^ÆW-¥.BTÊ;¥121(ms®)FWÛWJOMÆ,90°û<l

6.(3^>)$n®,ÆAAZ?C¥,AB=AC=5,BC=8,IUA>J0|ô^-¥¥S>J2K®,T

^iê+lEWjÆ:()

A.BÆOAl*JB.c&OA±

C.MfiC-^OAfflWD.MBC-!gOAM

['THJÎ]ÜA^AH±BCTH,i(nis,Ÿ-IJ^WHWûWÆfOJBH=CH=1BC=

2

4,IWJfflWféJ-WifWtHAH=3,AMW

W:ÜAtiftAH-LBCTH,M,

\’AB=AC,

:.BH=CH=1-BC=4,

2

ÆRtAAfiW^.A//=^AB2_BH2=>y52_42=3,

'.‘AB=5>3,

:.B&Æ.QAJWA

’.’AC=5>3,

.-.CAÆOALUB-,

:.AH±BC,AH=3>¥&,

AUA:D.

[Ai¥lfôooWW?Jr,0bùO«a/

d,^l^oo^d<r-,M/ffOÛfflt7J«6/=r;M/QOfàfà^d>r.Ü1

WJg=.

7.(3^)M,&MPNP'N',yiij

jm^'ù'nr^<>

A.AAB.ABc.AcD.AD

[Wrl'^PP\NN1.MM',PP'iï]M¥W&,WÉKJMY^,^MM'S<]^

^AMÆ^+'ù'.

[W^JW=to®,

VAMNP,fêljAW,

:.&&PP\NN\MM',

PPiïtâm®,ftwMfiWa,MwmW®,

AE&OflmWiEimB,

Bpm^-CÆB.

t&Æ:B.

[ÆW]mm,««

8.(3#)M,ÆAABCf,ZC=90°,AC=5,BC=10.ûM,NfrWkA,CiW

AIWM,âMIktiAJFféfëiiAC[Ri,^;cWi4*Wié®ÉFJMM,Æ;Nbk

CCBfàÆBl^<#2iSiS^bWlHj^t,M,C±|HJ

ÉKlE§M^jy,AMCWâ9ffi^S,WJy-^bsnwÆWiO^M^M()

A.

B.Æbbfÿija^^,

C.—

D.—

(5HfrliRfHy^r,s^rWÆ&ÜS^M^,WOSi^Ift^jW^JKBPnT.

[W^lft?:AM=t,CN=2t,

:.MC=AC-AM=5-t,

BPy=5-t,

’.S=—MC,CN=5t-t2,

2

ISlttyêtW-ÏÏMk,

i$i&:D.

L£i¥]

-,«S®

9.05Ȯ(-1,-3)(1,3).

[5HJT]MOJ/fli%TJMÆXJ»Wî±i.

[W-^lW:Æ(-1,-3)(1,3).

(I,3).

10.(35»ïïgrf-xtfJTjfëx2-kx-12=0tfj—4402,gjijkMÆfr-4.

[5Hfî]

[fWWJfâ:Æ!x=2^À?-kx-12=0f#4-2k-12=0,

k^-4.

-4.

L&VFJM«T-%-?WgâW:

H.(35»iîH^.O4K“&iâq^,(DffafàT;y

>9(0,3).v=-?+3(^^Pfe-).

[5HJf1a<Q,^Jffl-^®^Sa±^âÙ^WtiEôTWttlc

=3,®U=-1,b=0BIJnTWlHÉÈiÈ.

W-:iâ—^Ëâ^âW-'fJrïOy=ax2+bx+c.

:.a<0.

(0,3),

,’.c=3.

4Xa=-l,6=00t,-&®^ÛWtffïOy=-A3.

y=-?+3(^W-).

[ÆÎ¥]WE-&W

&{±!a<0,C=31Oôm

12.(3#)Wll^l

w,nm«imu,isi-umWWO

iè£F^19*.WW«iÉ^Mi+^{±lWW^ASD£^^38X-

[5>tliJÆH-lOOMWiérôiEtL,BJiÆR-HdWJMt»,

OîWDEXK,

MIJWWJ^-=X

191

ft?f#x=38.

miUWWDE38x.

38.

13.(3^)tinffl,Ettfziïffi-ABCD^AEB%&B90°

CFB,&fëEF,^A.E.FH.^ÆIsl-Èai»WJZAEB135°

ÈW$ÇÔ<Jtt®^lAB£F7jWH^^,m^AA£B^AB»HtTO$$90ofs

fà'h/\CFB,mt&fâZEBF=90°,Ufl&BEF»=

BPWW-

umi«=ÉWOI,

BE=BF,ZEBF=90°,

:.ZBEF=45°,

’.’A,E.FHâïElsJ—M^±

:.ZAEB=180°-45°=135°,

135°.

[AiTJMSisJOmiÉMWHÆ

14.(3#)MMy=ax2+bx+cxfô—

ax^+bx+c—Oxi=-1.X2=3.

[$<]

rw^lW:(-1,0),X=1,

(-1,0)2cTx=l(3,0),

WJ^tl^xttÈÙXÆ^:(-1,o)(3,0),

.'.£TxÉ<J-7E—ax2+bx+c=0ÛÜMÎR^:xi=-1,X2=3.

XI=-1,X2=3.

[£i¥izi&Mâwtx

15.(3^)PA,PB^OOM,ÿ]$MÏ&&A%}B,AC^QO^]^.%ZP

=60°,PÂ=6,MBC|W^2\/3•

[W]AB,PA=PB,AB=PA

=6,ZPAB=60°,fêfé«WMW2ÜZB4C=90o,OŒW^WPRL

[#?^1W-:T&&AB,

‘.'PA,PB^OOm^,

.'.PA=PB,

VZP=60°,

ZZPAB

:.AB=PA=6,ZPAB=60°,

•:PA^OOM,

.\ZPAC=90°,

:.ZCAB=30°,

'.•AClooOfê,

.•.ZÂBC=90°,

ÆRtAAÆC41,«C=Afi‘tanZCAB=6x2£ï=2V3,

3

2V3.

16.(3^)$ns,i£-YM<Æ»MxQv4’.MîEÉffi&liaAE,EFW

c.SftiA(-1,0),B(1,0),AE//BF,K¥-[iy$È

«DAEW±,y=x+hC^ïRW-4

(WJKM

ÆiàWWTMMÛW^,W&W^WWWc

B'IgMxWWMiuffl.

[$mM:^JlëAD,DB,W&Dl£-&&AEk,

V£DWAB^MféW¥IS|_t,

/.ZA£>B=90°,

:.BD±AD,

ÆRtADÛB^,ÈWÊSW,BD=\[2>

’:AE//BF,

.-.W^«AE>BF#fi£MIWËW;W2,

y=x+bcÆIN-.bZ>=V2^

-KZ><1.

Z?=V2f£-!<&<!-

WMRfêlÆféSWWiH,$@ïMBi®.

17.WM:

(1)?-9=0;

(2)A8X+1=0.

(Wrl(1)MMfêff¥MWHPnJ;

8fô-¥lW^,WM».

IW^JJW:(1)X2-9=0,

x2=9,

x=±3,

.‘.XI=3,X2=-3;

(2)x2+8x+l=0,

X2+8X=-1,

x2+8x+16=-1+16,

(x+4)2=15,

x+4=±VÏ5>

Xj=-4+VÏ5’X2=-4-V15-

[£+¥]mw-

(1)(2)(3)Wfcfô

H«n±-^W^-WJW.

18.(-1,0),B(3,0)ftC(0,3)=â,

SlfcÈÜJW^.

JJ!lJW£^y=a(x+1)(x-3),

WHÏECaW(t,JÀOt^Wrô.

[JW^lJW:i£-&®^lW#f5V3y=a(X+1)(x-3),

JEC(O,3)-3)=3,Wf#a=-1,

-(x+1)(x-3)=-X2+2X+3.

[Ai¥i

19.$nS,ABMOOMfé,®CD±Afi,SÆ^E,WÂB=20,CD=16.^AE^-fe.

(WJ«OC,OÏ^WæCE,OWaittlW.

[ftmW:«OC,

VAB=20,

:.OA=OB=oc=IAB=10,

2

22=226

0£=A/OC-CE710-8=’

pli]AE=OA-OE=10-6=4.

LW1

20.WOÆKÜg.

BfchOUÆOU^-âP(MI).

OP,

M2,

®ÆâÊU±OlWÆA,B-,

AP,BPÜ^

MSlU^T-.iMQ-,

®^^PQ,

P^El'ù',PCKK^¥a®OP.

WOPBP^jït

OH'Mi+MWfflftg,

(1)(»»);

(2)

WJ:ÜfêÂP,AQ,BP,BQ.

\'AP=AQ,BP=QB,

AAA,&BPQfilmai.

:.mABPQÈÙM¥3Ht

’JPQLl,PC^QP^}^,

.-.OP-^M/fflW(i?WJÆÆS)(IMMWra).

P

ABl

ES2

[Wri(i)

rftmw=entRMT-^a^ww:

BP=QB,

AB=AB,

:.£\APB^/\AQB(SAS\

^ZPAB=ZQAB,

AP=AQ,

ZPAB=ZQAB,

AC=AC,

ZAPC^ZAQC,

WAPC=CQ,ZAPC=ZACQ=M°,

BPABPQ

’.’PQZl,PC^QP^,

.■.o/’W/w

AQ,QB,

L&WJ

21.“&MÛWFr5£;i^x2-2x-3

(1)-!=ix(-1,0),(3.0)T5iÆÆ^M(1■-4);

(2)'1■fljfflffli;

X

y

(3)^-2^x<2Hj,ÔÜMffiH.

(WJ(1)«ÿÈ^y=?-2x-3,

(2)

^MÆÆSBPôT;

(3)w^-i'ujMa™niwtH^a.

Œ-^lW:(1)4_y=0,M0=?-Zr-3,

)WWxi=-bX2=3,

(-1,0),(3,0),

y=x2-2x-3=(x-1)?-4,

FJfW’ÈÛWMO(1,-4),

(-1,0),(3,0),(1,-4);

(2)?!|^:

(3)âx=-2Ht,y=4+4-3=5»

/.sâ-2<x<2ilj,-4s£ysS5.

[âwi

iffl-&aM®njKWHJ,FOM.

22.ÆMFOWSM«4b

(1)^△AJ5C^âA)ll!Ü0'î#^9O0,WtW^feÉKjAABiCi

(2)B

:

zÇZ-ui)=(i-iu)çui-)=v=t$lü®lgE|3(l)iW[^iWJ

(2)

(i)[^1

WWW(Z)

(I)

•o=I-Ui+xui-fr'£2

twrrw^‘W^HOFBmw

*^IÉWT4W^»W}W®&3ÜÏ[*!■?']

S081

yÏ?ÏW

‘s^z^+gs^gy(2)

^«□WVTO(i):M[^Wl

o'mnswim£gn&(2)

siu[iaowifflMiwwwwÊO(i)[^1

V(m-2)2^0,

(2)x=m-l^x=l

'.m-1<0.

,’.m<1.

L&VFJ*Mi-7ü2mMM

TSMS.

24.ftffl,AZJ^HÛÛ’J^,OAZOD,AB,ODfàRTtiC,ÏLCD=BD.

(1)wBD*g[S|O

(2)*iOA=3,OC=int,W^D^JL

(W1(1)«OB,ÈBD=CD,m^fâfifâ$\ZDCB=ZDBC,MÉAÛ^Ê

ÈZrOD,AOCWOWÜOB

BD,gpqWiiE;

(2)i£BD=x,JfllJOD=JC+1,ÆRT/\OBDWïWÆïlWtH32+x2=(x+1)2,

saw^gBPW#.

[W-^l(1)iiEPJl:&&OB,

\'OA=OB,DC=DB,

:.ZA=ZABO,ZDCB=ZDBC,

ZAOZOD,

:.ZAOC=W°,\^ZA+ZACO=^°,

VZACO=ZDCB^ZDBC,

:.ZABO+ZDBC=9Q°,WOBZBD,

WJBDOMW;

(2)W;T&BD=X,MOD=x+l,ïftOB=OA=3,

fë.RT△OBDrfi,OB2+BD2=OD2,

BP32+?=(x+1)2,

mx=4,

.-.asBDÉKJ-KÆ4.

[ÆWlWÆSÉKj&ffl,WHOÔW,MWW

25.r’^'BîÈT-iÉEi'È't1'CÆlKÿ^sr"^TKW-7KWK®^:$c~

MWWùfôTKWftxft.iOMIJinOfl:

x/%012344.4

y/^z2.53.33.32.50.90

£Wy&xttj^!l,^y^xM^W^WMWiftlrT

(I)xOyrh,ÏStH^4>^ÉâMmiSâ<J^(x,y),#ffl}±lM6<J

SÜ;

(2)^îra-aütKt.,tHzKnSËiilllSÎÛÙift®^2.5X,TKiÈ^JBitt^B'J'-^ilIl^'Ù'lWzK

TSËM^1.5%;

(3)MJfM7K?t!iW?a5%,RWMzmËW'b^1.5

X,£H»zkWiW®,MliLWW,WtB7knS'>ffiMIW(«

“«”J£“(W)1.8X

[5HJf1(1)BPp]WIÉm;

(2)

(3)^tBaoîw:,^%=3.5swfoj^.

(W^îfâ:(1)fflltBMlftfflflftlT:

(2)ÉBWI.-V=OIH,y=2.5,

.’.tHzKnïËtâïMWîffg^j2.5X.

2.5,1.5;

(3)y=ax2+bx+c,

(0,2.5)(1,3.3)(2,3.3)^ÀnTW,

c=2.5

*a+b+c=3.3

4a+2b+c=3.3

'a=-0.4

»W-<b=l.2’

c=2.5

•"•yxy—-0.4X2+1.2X+2.5,

V5-1.5=3.5,

.'.âx=3.5W,y=-0.4X3.52+1.2X3.5+2.5=1.8,

A1.8

IW,1.8.

L6W1»*Û<]Wiœit±ia^lS^W^^.

26.xOy41,(1,w),(3>n)y=ax2+bx+c(a<0)_h,iji

(1)Sc=-3,t=2B},ym,nÛWh^;

(2)A(xo,m)ÆM^±,JEL2<XO<3,ttflMffl,JWm,n,c

[WJ(1)*x=0,^Wy=-3,

a+b-3-m

9a+3b-3=n

£BPn]WÜOfWBPRT^Wm=>v.

—^-=2

2a

(2)1,^BtOS-ft®MWttBPnK#}±!m

2

[MME]W:(1)4‘x=0,WJy=ax1+bx+c=c,

\'c=-3,

WXÆéyzrôl(0,-3),

(1>rn\(3,n)RÀUôW^^tJr^,

a+b-3=m

9a+3b~3=n

—=2

2a

m=n.

(0,-3),m,m=n-,

(2)’.'HÈWfeËy=cv?+bx+c(i/<0)iï,^(1,w)>(xo,/?/),

•t=1+X°

2

V2<JCO<3,

/.Â</<2,

2

□fàT,WW»yPIxWWOIyPfixl'rWî

±ïïnMzJsKû(1.w)SiJ^-fWÛÛïËi^MÆ,iï.(0.c)

.‘.m>n>c.

[ÆW-]A&MSMZÆIWFIHE,

gA&SiMW-

27.BfcbOJ&ÆAMBM

a/Ma,SÆ#55llftÆcfnD.

(DM1,^P^oî^,OC5ODfàM^-,

(2)&@2,P^^®A5±ffi.&-*W,

©OtfriS®:

ocwOD#im

(3)3,%ZCOD=60°,BD.OCZmn%%C

[#frfl(DÉ“AAS1’nîvL/\OAC^AOBD,WfàOC=OD-,

(2)©MfrrM;

®É“ASA”«JiiF.AAOC^ABOE,ËTf#OC=OE,«JWOC=OD-,

(3)É“ASA”WAAOC^ABOE,BTWOC=OE,É^HÆ^WtÉ^WOC=

OD,=:O;WmnnT.

[W^lW-:(DSAOAC^AOBDÉ,

'ZA0C=ZB0D

<ZOCA=ZODB=90°>

OA=OB

.'./\OAC=/\OBDZAAS),

:.OC=OD-,

(2)

®OC=OD,SÈ&1T:

M,fé-KCOKBDTAE,

’.'ACLCD,BDLCD,

.‘.AC//BD,

ZA=ZB,

OZjABtfj'pü,

LAO=BO,

VZAOC=ZBOE,

LL.AOCZLBOE(ASAL

:.OC=OE,

:.&0:hCE^&,

:.DORtACDEMü±

温馨提示

  • 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
  • 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
  • 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
  • 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
  • 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
  • 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
  • 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

评论

0/150

提交评论