人教版數(shù)學(xué)八年級(jí)上試題1521第1課時(shí)分式乘除3

“分式得乘除法”復(fù)習(xí)題.填空題1.約分：m22m1；a31；b3n1a2a（n為正1m21aa2a2n1b3n2整數(shù)）計(jì)算：(2c)4(ab2)2；(a2)2(b2)(1)4；2cbaabx2y22；y2112x11；(y)(x2)(xy)(2x)(y2)2(bc2)62222y(3c3)3；(xyx2)x2xyyxx。4ab2axy二.判斷題以下運(yùn)算正確得打“√”，錯(cuò)誤得打“×”：1.2xxyxy2x12x（）xyyyxyxy2.(x2y)3x6y3（）zz33.4.5.

(x3y2)2x9y24（）zz24n(b)2nb2n（n為正整數(shù)）（）aa2b38b9(2)36（）3a27a三.選擇題1.已知x:y3，則分式(xy)2得值是（）x2y2A.3B.27C.1D.144262132.在分式a，6xy，x2y2，yx，x3y3中，最簡(jiǎn)分式有3x2x2yx2y2(xy)2x2y2（）A.1個(gè)B.2個(gè)C.3個(gè)D.4個(gè)3.以下各式正確得是（）A.C.

x2y2xyx2y2xyab2b

B.D.

x22x1(x1)22xx21x1c)2c2(a2b2ab四.計(jì)算1.8x2(3x3)(6z2)4yxy2.(3x2)3(a3b3)(ba2)2abba3.y2(ab)yaba2x2x2(ab)xabb2y24.x26x9x29x3x2x6x23x102(x5)5.6.

2x6(x3)x2x644xx23xx2x1[1x3(x2x2)]x211x27.a27a10a31a2a1a26a5a24a4a28.(a2b2)2(a)3abab9.(a2x2)3(a22axx2)2(a21a2x2a4x4axx2)210.a2b2c22aba2b2c22bca2b2c22aca2b2c22ab11.(xy)2[xyy2]xyy2(xy)223y1y12.xx3223y11xxy3213.x32x2x2x24x4x21x24x4x32x2x2x2114.2x16124x(x2)x24x4x2415.[a7b2](a2b2)4[a2(ba)]33(ab)a2216.(8a22b2)4a2b4ab2b3b2，此中a1，b1。2b25ab3a2b25ab6a24【試題答案】一.1.m1；a1；b2.4a2b4c2；1；1；27a9；x2yy21maab4b15yx二.1.×2.×3.×4.×5.√三.1.C2.B3.B四.1.解：原式8x23x6z36xz4y3x2yy42.解：原式27x922(ab)227(ab)(a2abb2)x9(ab)3(ab)(aabb)(ba2)2(ab)(ba2)2解：原式解：原式解：原式解：原式

(ya)(yb)(ax)(ax)(ya)(xa)(ya)(xa)(xa)(xb)(by)(by)(xb)(by)(xb)(yb)(x3)2(x5)(x2)x31(x3)(x2)(x3)(x3)2(x5)22(x3)1(x3)(x2)2(x2)2x33xx2x2x1[(1x)(x2x1)1]x211x2(x2)(x1)x2x1(1x2)(x2)(x2)x2x21x2x17.解：原式(a2)(a5)(a1)(a2a1)a2(a1)(a5)(a2)2a21a1解：原式解：原式

(ab)2(ab)2a3a3(ab)2a(ab)2a2b2(ab)3a2b2b2(ax)3(ax)3(a2x2)(ax)(ax)11a2x2(ax)4(ax)4解：原式解：原式解：原式解：原式解：原式解：原式

(abc)(abc)(abc)(abc)abc(abc)(abc)(abc)(abc)abc(xy)2[(xy)2](xy)(xy)y(xy)y(xy)y22x3y2x3y2x3y2x3yx612x3y2x3y2x3y2x3yx6x2(x2)(x2)(x2)2(x1)(x1)(x2)2x2(x2)(x2)x21(x21)(x2)(x2)2(x1)(x1)(x2)2(x1)(x1)(x2)x21222(x8)(x2)(x2)1x8(x2)24(3x)x22(3x)(x2)a7b2(ab)4(ab)488(ab)3b2(ab)3(ab)a2a6(ba)33a216.解：原式