初二上学期数学辅导讲义(9)

1、初二上学期数学辅导4辅导内容：期中专题训练班级 学号 姓名 日期：2007-10-14一、填空题： 1、当x 时，二次根式有意义；2、二次根式有意义的x的取值范围是 ；3、在实数范围内分解因式：= ；4、成立的条件是 ；5、成立的条件是 ；6、成立的条件是 ；7、已知，则x的取值范围是 ；8、如果最简二次根式与是同类二次根式，则 ；9、如果与是同类二次根式，则x可取的最小正整数为 ；10、如果成立，则x的取值范围是 ；11、若b0，化简：= ；12、如果与是同类二次根式，则= ；13、若x0，则= ；14、比较大小： ；15、在实数范围内分解因式：= ；16、计算：= ；17、如果0是一元二次

2、方程的一个根，则另一个根是 ；18、当x= 时，二次三项式的值是；19、将方程化为一般式是 ；20、方程的根是 ；21、如果a是方程较小的一个根，= ；22、试设计一个一元二次方程，使得它的两个根分别为和3，且一次项的系数为2，则这个方程可以是 ；23、若关于x的一元二次方程有两个相等的实数根，则m= ，此时方程的根为 ；24、当m 时，方程有两个不相等的实数根；25、若关于x的方程无实数根，则m ； 26、如果一元二次方程的两个根分别为，则这个方程的一般式是 ；二、选择题： 1、化简的结果是（ ）(a)0 (b)2a (c) 2a (d) 2 2、下列各式正确的是（ ）(a) (b) (c)

3、 (d) 3、化简的结果是（ ）(a)3 (b)0 (c) (d) 4、已知：a=，b=，则a与b的大小关系是（ ）(a) a=b (b) ab (c) a+b=0 (d) 5、化简的结果是（ ）(a) (b) (c) (d) 6、下列不是同类二次根式的一组是（ ）(a)与 (b)与 (c)与 (d)与 7、下列方程是一元二次方程的是（ ）(a) (b)（a是常数）(c) （k是常数） (d) 8、不可能是（ ）(a)有理数 (b)非负数 (c) 负数 (d)非正数9、下列方程中， (1)，(2)， (3)， (4)， 一元二次方程共有（ ）(a)1个 (b)2个 (c)3个 (d)4个 10

4、、若分式的值为零，则x的值为（ ）(a) (b) x=1或x=2 (c) x=1 (d) x=2 11、方程（）的根是（ ）(a) (b) (c) (d)无实数根 12、若成立，则x应满足（ ）(a) (b) (c) (d) 13、方程的根的情况是（ ）(a)有两个不相等的实数根 (b)有两个相等的实数根 (c) 没有实数根 (d) 与的值有关，不能确定14、若一元二次方程有一根为，则有（ ）(a)a+b+c=0 (b) a-b+c=0 (c) )a+b+c=1 (d) a-b+c=1 15、下列一元二次方程的根的情况中，不正确的是（ ）(a)有两个不相等的实数根 (b) 有两个相等的实数根(

5、c)没有实数根 (d) 有两个实数根16、若，则（ ）(a) (b) (c) (d)a是任何实数 17、化简的值是（ ）(a)0 (b) (c) (d) 18、下列语句不是命题的是（ ）(a)负数与负数的差是负数 (b)在直线ab上任取一点c(c)一个锐角的补角大于它的余角 (d)同位角互补，两直线平行 19、下列命题中，真命题是（ ）(a) 如果ab=0，那么a=0 (b) 三角形的中线将三角形的面积平分(c)等腰三角形不可能是钝角三角形 (d) 无理数加上无理数还是无理数辅导内容：计算综合部分三、计算题：1、 2、3、 4、5、 6、 7、四、解方程： 1、 2、3、 4、5、 6、7、

6、8、9、 10、五、因式分解： 1、 2、3、 4、5、 6、六、综合题： 1、若a，b分别是的整数部分和小数部分。求的值。待添加的隐藏文字内容32、已知，求的值。3、若a、b、c为abc的三边长，化简：4、当m为何值时，关于x的一元二次方程有两个实数根。6、已知：关于x的一元二次方程没有实数根，试判别方程的根的情况。winger tuivasa-sheck, who scored two tries in the kiwis 20-18 semi-final win over england, has been passed fit after a lower-leg injury, whi

7、le slater has been named at full-back but is still recovering from a knee injury aggravated against usa.both sides boast 100% records heading into the encounter but australia have not conceded a try since josh charnleys effort in their first pool match against england on the opening day.aussie winge

8、r jarryd hayne is the competitions top try scorer with nine, closely followed by tuivasa-sheck with eight.but it is recently named rugby league international federation player of the year sonny bill williams who has attracted the most interest in the tournament so far.the kiwi - with a tournament hi

9、gh 17 offloads - has the chance of becoming the first player to win the world cup in both rugby league and rugby union after triumphing with the all blacks in 2011.id give every award back in a heartbeat just to get across the line this weekend, said williams.the (lack of) air up there watch mcayman

10、 islands-based webb, the head of fifas anti-racism taskforce, is in london for the football associations 150th anniversary celebrations and will attend citys premier league match at chelsea on sunday.i am going to be at the match tomorrow and i have asked to meet yaya toure, he told bbc sport.for me

11、 its about how he felt and i would like to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedings against cskafor the racist behaviour of their fans duringcitys 2-1 win.michel platini, president of european footballs governing body, has also ordered an immedia

12、te investigation into the referees actions.cska said they were surprised and disappointed by toures complaint. in a statement the russian side added: we found no racist insults from fans of cska. baumgartner the disappointing news: mission aborted.the supersonic descent could happen as early as sund

13、a.the weather plays an important role in this mission. starting at the ground, conditions have to be very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. the balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere)

14、 where our day-to-day weather lives. it will climb higher than the tip of mount everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and into the stratosphere. as he crosses the boundary layer (called the tropopause)

15、,e can expect a lot of turbulence.the balloon will slowly drift to the edge of space at 120,000 feet ( then, i would assume, he will slowly step out onto something resembling an olympic diving platform.they blew it in 2008 when they got caught cold in the final and they will not make the same mistak

16、e against the kiwis in manchester.five years ago they cruised through to the final and so far history has repeated itself here - the last try they conceded was scored by englands josh charnley in the opening game of the tournament.that could be classed as a weakness, a team under-cooked - but i have

17、 been impressed by the kangaroos focus in their games since then.they have been concentrating on the sort of stuff that wins you tough, even contests - strong defence, especially on their own goal-line, completing sets and a good kick-chase. theyve been great at all the unglamorous stuff that often

18、goes unnoticed in the stands but not by your team-mates.it is as though their entire tournament has been preparation for the final.in johnathan thurston, cooper cronk, cameron smith and either billy slater or greg inglis at full-back they have a spine that is unmatched in rugby league. they have played in so many high-pressure games - a priceless asset