1521分式的乘除同步练习

1.填空题约分:m2 2m 12m2.计算:(2c)4ab2)22c)i.2.3.4.5.1.2.“分式的乘除法”复习题2aa 3n 2b（n为正整数）吐)4(x)2y)32、 xy )2y )11(至V1y（孰一；（xyx2)2xyxy2x y2x判断题下列运算正确的打“ “”，错误的打“X”2x2(Jz2x)33y3zb2()a2n2b3(37)选择题已知x:在分式B.94x y2zb4n2n a（n为正整数）（8b927a6则分式27266xy2x 2y（x汇的值是2yx2C.D.14132x2 2 x yx(x y)23 x2 x中，最简分式有（）A.2 x2yxyB.2 x2x1(x222x21xyxyxxa b2C.a(c 、2cD.b2b( ab)2 .2a bA. 1个 B. 2 个 C. 3 个3.下列各式正确的是（）D. 4个四.计算1.8x* 2 (43X3)6zT2.3x233(ab3)(b a2、2 (ba）3 y 2 (a b)y ab a2 x22x 6x2 x 65. (x 3)3x ( 22 (xxx 2)2c x X6.x 1a2 7a7. P 5103a 1a2 4a 4a2 a 18.(叮)2ab9.(a22 a2 3x )(a22ax x2)210.12.13.x2b2x4(a2ax2 2x )2abb22bca2 b2(x y)22xy y2 3yx3yc21x31x32aca2b2c22abxy厶2-1 y)(X21 -y2x2 4x 432小x 2x x 2x2114.2x 1612 4xx2 4x 4(X 2)a2(b a)/215.a7b2 (a2 b2)43(a b) a2一224a2b 4ab2 b3b亠1116 (8a 2b ) 一2 2，其中a-,bo2b5ab 3a b5ab 6a24“ m1 彳bc1.;a 1；-21ma【试题答案】2424a b c ；1ab41; 27a91. x 2. x3. x 4.1. C 2. B3. B1.解:原式8x23x4y36z-x y36 xzy2.解:原式27x9(a b)3(a b)(a2 abb2)(a b)2(b a2)227(a3.解:原式(y a)(y b) (a x)(ax)(y a)(xa)4.解:原式5.解:原式6. 解:原式7.解:原式8.解:原式9.解:原式(x a)(x b) (b y)(b y)(x b)(b y)229b)(a ab b )x(a b)(b a2)2(y a)(x a) (x b)(y b)(x 3)2(x 3)(x2)(x 5)(x2)(x 3)(x 3)x 32(x 5)2(x 3)1(x2)2 x2x2xxx21(x 3)(x 2)3 x(1 x)(x2 x 1)2x(12X )(X2)x2 x 1(x(x2)(x1)2)(a 2)(a 5)(a 1)(a 5)2(a 1)(a a(a b)2(a b)21)(a 2)3a(a b)33a (aa 22a aa2b2a(a b)2b2(a x)410.解：原式(abc)(abc)(abc)(abc)abc(abc)(abc)(abc)(abc)abc11解：原式 & y)2 (x y) y(x y) y(x y)(x y)(x y)2y12.解：原式2x 3y 2x 3yx6 2x 3y 2x 3y2x 3y 2x 3y 2x 3y 2x 3yx613.解：原式x2(x 2) (x 2) (x 2)2 (x 1)(x 1)(x 2)2 x2 (x 2) (x 2) x21(x21)(x 2) (x 2)2(x 1)(x 1)(x 2)2 (x 1)(x 1)(x 2)x21x 2x 214.解：原式坐卑as x 8(x 2)4(3 x) x 22(3 x)(x 2)15.解：原式a7b2(a b)4(a b)488(a b)3b2(a b)3(a b)a2a6(b a)33a216.解：原式2(2ab)(2a(2b a)(b 2a)2b(2a b)b(b 2a)(b 3a)2(a 2b)2a 4b2a b2a b2x(丄)4 12411(1)当a, b 时，原式24代数式的值为03.x2 (a b)x ab b2 y2x 6x 9 x 9 x 3