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当前位置:首页 > 中学教育 > 初中教育 > 八年级数学-----分式的乘除法同步练习
-1-分式的乘除法练习题一.选择题1.约简分式22yxayax后得[]A.yxa2;B.yxa;C.yxa;D.yxa2.2.约简分式baba22后得[]A.-a+b;B.-a-b;C.a-b;D.a+b.3.分式axy434,1142xx,yxyxyx22,2222bababa中,最简分式有[]A.1个;B.2个;C.3个;D.4个.4.计算①bayx,②nmmn,③xx24,④2222baba所得的结果中,是分式的是[]A.只有①;B.有①、④;C.只有④;D.不同以上答案.5.cdaxcdab4322等于[]A.xb322;B.23b2x;C.-xb322;D.-222283dcxba.6.23222aaaa·5(a+1)2等于[]A.a2+2a+1;B.5a2+10a+5;C.5a2-1;D.5a2-5.7.下列各式中,化简成最简分式后得121x的是[]A.144122xxx;B.144122xxx;C.4141212xx;D.4121212xxx.8.当x>2时,化简32|3||1|2xxxx的结果是[]A.-1;B.1;C.1或-1;D.0.9.若x等于它的倒数,则分式1332622xxxxxx的值为[]A.-1;B.5;C.-1或5;D.-41或4.二.计算题1.22222121221xxxxxxxx2.22222222223654523212xxxxxxxxxxxx三.先化简,再求值2322322)2(bbbababbaba,其中a=21,b=31四.已知y-2x=0,求代数式))(())((332222yxyxyxyxyx的值.五.若)(|3|))(3(xmxmxx=1,求x的取值范围.-2-八年级下:分式的乘除法同步练习一、判断正误(对的打“√”,错的打“×”)(每小题3分,共15分)1.yxyx22=x+y()2.(p-q)2÷(q-p)2=1()3.48xxx2()4.)(3)(2)(9)(422nmnmnmnm()5.bambma(m≠0)()二、请你填一填(每小题4分,共32分)1.把一个分式的分子与分母的约去,叫做分式的约分;在分式222xyxyxy中,分子与分母的公因式是.2.将下列分式约分:(1)258xx=;(2)22357mnnm=;(3)22)()(abba=.3.计算2223362cabbcba=.4.计算42222abaaabababa=.5.计算(-yx)2·(-32yx)3÷(-yx)4=.6.已知x-y=xy,则x1-y1=________.7.若a1∶b1∶c1=2∶3∶4,则a∶b∶c=_____________.8.若4x=4y=5z,则zyxyx32=_____________.三、细心算一算:(每小题10分,共40分)1.计算:(1)abba22÷(a-b)2(2)(yx32)2·(xy43)3÷(41xy)2.先化简,再求值:222693babaaba,其中a=-8,b=21.3.若x1-y1=3,求yxyxyxyx2232的值.四、用数学眼光看世界(10分)甲队在n天内挖水渠a米,乙队在m天内挖水渠b米,如果两队同时挖水渠,要挖x米,需要多少天才能完成?(用代数式表示)-3-分式的乘除同步练习一、选择题1、计算(2xy)2·(2yx)3÷(-yx)4得()A.x5B.x5yC.y5D.x152、计算(2xy)·(yx)÷(-yx)的结果是()A.2xyB.yx2C.xyD.yx3、化简:(3xyz)2·(xzy)·(2yzx)3等于()A.232yzxB.xy4z2C.xy4z4D.y5z4、(-3ab)÷6ab的结果是()A.-8a2B.-2abC.-218abD.-212b5、-3xy÷223yx的值等于()A.-292xyB.-2y2C.-229yxD.-2x2y26.(-3ab)÷6ab的结果是()A.-8a2B.-2abC.-218abD.-212b7.-3xy÷223yx的值等于()A.-292xyB.-2y2C.-229yxD.-2x2y28.下列公式中是最简分式的是()A.21227baB.22()abbaC.22xyxyD.22xyxy9.(巧解题)已知x2-5x-1997=0,则代数式32(2)(1)12xxx的值是()A.1999B.2000C.2001D.200210.(学科综合题)使代数式33xx÷24xx有意义的x的值是()A.x≠3且x≠-2B.x≠3且x≠4C.x≠3且x≠-3D.x≠-2且x≠3且x≠411.计算:(xy-x2)·xyxy=.12.将分式22xxx化简得1xx,则x应满足的条件是.二、计算:13、3232cba14、32432ababab15、2223xymn·2254mnxy÷53xymn.16、22121aaa÷21aaa.17、2216168mmm÷428mm·22mm.18.计算22121aaa÷21aaa.-4-分式的乘除1.计算:3222.cababc=.2.计算:4()7yxx=.3.下列分式中,是最简分式的是()A.21227baB.22()abbaC.22xyxyD.22xyxy4.下列各式中,计算结果是分式的是()A.nambB.32nmmnC.35xxD.3223734xxyy5.计算:(1)22432mnnm;(2)263xxyy;(3)2510621yyxx;(4)2263244xxxxx.6.计算:(1)2222412144mmmmmm;(2)269(3)2xxxx.(3)22238()4xyzzy;(4)2226934xxxxx.(5)2236abaxcdcd;(6)2224369aaaaa.7、已知:a=2,b=3,求代数式322222222ababaabaabbab的值.【自主检测】1.计算:2()xyx·xyxy=________.2.计算:23233yxyx________.3.计算:3()9aabb=________.4.计算:233xyxyaa=________.5.若m等于它的倒数,则分式mmmmm332422的值为()A.-1B.3C.-1或3D.416.计算2()xyxxyx的结果()A.2()xyB.yx2C.2xD.x7.计算2(1)(2)3(1)(1)(2)aaaaa的结果是()A.3a2-1B.3a2-3C.3a2+6a+3D.a2+2a+18.已知x等于它的倒数,则263xxx÷2356xxx的值是()A.-3B.-2C.-1D.09.计算22121aaa÷21aaa.
本文标题:八年级数学-----分式的乘除法同步练习
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