初二上學(xué)期數(shù)學(xué)輔導(dǎo)講義(9)

1、初二上學(xué)期數(shù)學(xué)輔導(dǎo)4輔導(dǎo)內(nèi)容：期中專題訓(xùn)練班級 學(xué)號 姓名 日期：2007-10-14一、填空題： 1、當(dāng)x 時，二次根式有意義；2、二次根式有意義的x的取值范圍是 ；3、在實數(shù)范圍內(nèi)分解因式：= ；4、成立的條件是 ；5、成立的條件是 ；6、成立的條件是 ；7、已知，則x的取值范圍是 ；8、如果最簡二次根式與是同類二次根式，則 ；9、如果與是同類二次根式，則x可取的最小正整數(shù)為 ；10、如果成立，則x的取值范圍是 ；11、若b0，化簡：= ；12、如果與是同類二次根式，則= ；13、若x0，則= ；14、比較大?。?；15、在實數(shù)范圍內(nèi)分解因式：= ；16、計算：= ；17、如果0是一元二次

2、方程的一個根，則另一個根是 ；18、當(dāng)x= 時，二次三項式的值是；19、將方程化為一般式是 ；20、方程的根是 ；21、如果a是方程較小的一個根，= ；22、試設(shè)計一個一元二次方程，使得它的兩個根分別為和3，且一次項的系數(shù)為2，則這個方程可以是 ；23、若關(guān)于x的一元二次方程有兩個相等的實數(shù)根，則m= ，此時方程的根為 ；24、當(dāng)m 時，方程有兩個不相等的實數(shù)根；25、若關(guān)于x的方程無實數(shù)根，則m ； 26、如果一元二次方程的兩個根分別為，則這個方程的一般式是 ；二、選擇題： 1、化簡的結(jié)果是（ ）(a)0 (b)2a (c) 2a (d) 2 2、下列各式正確的是（ ）(a) (b) (c)

3、 (d) 3、化簡的結(jié)果是（ ）(a)3 (b)0 (c) (d) 4、已知：a=，b=，則a與b的大小關(guān)系是（ ）(a) a=b (b) ab (c) a+b=0 (d) 5、化簡的結(jié)果是（ ）(a) (b) (c) (d) 6、下列不是同類二次根式的一組是（ ）(a)與 (b)與 (c)與 (d)與 7、下列方程是一元二次方程的是（ ）(a) (b)（a是常數(shù)）(c) （k是常數(shù)） (d) 8、不可能是（ ）(a)有理數(shù) (b)非負數(shù) (c) 負數(shù) (d)非正數(shù)9、下列方程中， (1)，(2)， (3)， (4)， 一元二次方程共有（ ）(a)1個 (b)2個 (c)3個 (d)4個 10

4、、若分式的值為零，則x的值為（ ）(a) (b) x=1或x=2 (c) x=1 (d) x=2 11、方程（）的根是（ ）(a) (b) (c) (d)無實數(shù)根 12、若成立，則x應(yīng)滿足（ ）(a) (b) (c) (d) 13、方程的根的情況是（ ）(a)有兩個不相等的實數(shù)根 (b)有兩個相等的實數(shù)根 (c) 沒有實數(shù)根 (d) 與的值有關(guān)，不能確定14、若一元二次方程有一根為，則有（ ）(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況中，不正確的是（ ）(a)有兩個不相等的實數(shù)根 (b) 有兩個相等的實數(shù)根(

5、c)沒有實數(shù)根 (d) 有兩個實數(shù)根16、若，則（ ）(a) (b) (c) (d)a是任何實數(shù) 17、化簡的值是（ ）(a)0 (b) (c) (d) 18、下列語句不是命題的是（ ）(a)負數(shù)與負數(shù)的差是負數(shù) (b)在直線ab上任取一點c(c)一個銳角的補角大于它的余角 (d)同位角互補，兩直線平行 19、下列命題中，真命題是（ ）(a) 如果ab=0，那么a=0 (b) 三角形的中線將三角形的面積平分(c)等腰三角形不可能是鈍角三角形 (d) 無理數(shù)加上無理數(shù)還是無理數(shù)輔導(dǎo)內(nèi)容：計算綜合部分三、計算題：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、綜合題： 1、若a，b分別是的整數(shù)部分和小數(shù)部分。求的值。待添加的隱藏文字內(nèi)容32、已知，求的值。3、若a、b、c為abc的三邊長，化簡：4、當(dāng)m為何值時，關(guān)于x的一元二次方程有兩個實數(shù)根。6、已知：關(guān)于x的一元二次方程沒有實數(shù)根，試判別方程的根的情況。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