人教版八年级数学上册分式的加减法练习题8.doc

1、3x3y 7yx3y2 x3y2 5 2 x3n x3nb8 9 b b y 7y y y5 y5 y5 3 33c2d2 5cd 4a 6a 5a4 (5a4)2 m 5 m2y2 my mm6 m16x4y 4xx3y2 x3y2 1 5 p a p ab1 9 b b 8a a a a4 a4 a4 2 17c2d2 9cd 3a a 4a9 (4a9)2 x 4 x2b2 xb m2m3 m3 x8y 6yxy3 xy3 5 52x a 2x am9 1 m m 3m 5m 4m m6 m6 m6 1 16c2d 3c2d2 n n 4n5 (4n5)2 a 5 a2b2 ab x2x

2、9 x4 x5y 2yxy3 xy3 3 33y3b 3y3ba4 4 a a 8x 6x 2x x7 x7 x7 4 12c2d2 8c2d 7x 9x 5x9 (5x9)2 a 3 a2b2 ab xx6 x8 x y 5xxy xy 2 42p a 2p an4 2 n n 7x x x x8 x8 x8 2 14c2d2 9cd2 x 6x 4x7 (4x7)2 m 5 m2n2 mn a2a6 a24x y 4yx2y3 x2y3 4 42y n 2y nn9 3 n n a a 9a a8 a8 a8 2 22cd2 9cd2 a 3a 6a9 (6a9)2 b 1 x2b2 xb

3、 aa2 a14x5y 7xx2y3 x2y3 1 12m3n 2m3nx8 1 x x 7b 9b b b7 b7 b7 1 28cd 2c2d2 y 9y 6y2 (6y2)2 x 4 x2b2 xb xx5 x83x y 8yx2y3 x2y3 3 2 p3q p3qx2 4 x x 5m m m m9 m9 m9 3 45c2d2 4cd2 9b 5b 2b9 (2b9)2 m 3 m2y2 my mm6 m3 x7y 7xxy2 xy2 2 52x b 2x ba4 3 a a x 6x x x7 x7 x7 1 29c2d2 5c2d2 x 7x 6x5 (6x5)2 b 3 a2

4、b2 ab m2m7 m8 x y 8xx3y2 x3y2 3 32y b 2y bb8 7 b b n n n n1 n1 n1 3 36cd 8cd 4m 7m 3m9 (3m9)2 x 3 x2y2 xy aa8 a89x y 6xx3y x3y 2 33m2q 3m2qn2 4 n n 8m m m m2 m2 m2 3 46c2d2 2c2d 8n n 6n4 (6n4)2 a 4 a2y2 ay mm7 m4 x y 6xx3y3 x3y3 2 4 y2q y2qa2 2 a a b b b b8 b8 b8 3 16cd2 4c2d a 6a 2a5 (2a5)2 y 3 m2y

5、2 my mm9 m6 x8y 4yx2y x2y 3 43y n 3y ny8 9 y y b 7b b b2 b2 b2 3 19cd2 3cd2 3x x 5x7 (5x7)2 y 3 m2y2 my m2m8 m4 x9y 7xxy3 xy3 2 52m b 2m bn7 6 n n x 2x 6x x1 x1 x1 2 17cd2 2c2d2 3a 4a 5a8 (5a8)2 a 1 a2y2 ay a2a5 a4 x5y 3xxy3 xy3 5 23y a 3y ab1 4 b b b b b b4 b4 b4 3 19c2d 4cd2 9m m 5m8 (5m8)2 a 3 a2

6、n2 an mm2 m47x y 7yx2y x2y 4 23x2a 3x2aa8 3 a a a a a a2 a2 a2 2 32cd2 8c2d m 8m 3m7 (3m7)2 x 4 x2b2 xb m2m3 m67x6y 8xx3y3 x3y3 4 5 m n m nx7 5 x x 9x x x x4 x4 x4 4 33c2d 8cd2 b 9b 4b4 (4b4)2 b 6 m2b2 mb a2a8 a3 x y 9xxy2 xy2 5 13m2n 3m2nx6 1 x x 7b 4b b b9 b9 b9 1 37c2d2 6c2d 6x x 3x3 (3x3)2 a 6 a

7、2b2 ab x2x1 x45x y 2yxy xy 4 1 m2q m2qy3 5 y y b b b b8 b8 b8 2 42c2d2 6cd2 x 2x 3x3 (3x3)2 y 1 a2y2 ay xx3 x64x7y 8yx2y2 x2y2 3 2 m n m nm4 4 m m b b 5b b2 b2 b2 2 26cd 3cd a a 2a8 (2a8)2 x 4 x2b2 xb x2x6 x76x6y 5xx3y2 x3y2 2 3 m3b m3by2 1 y y m m 4m m2 m2 m2 2 47c2d 9cd m m 3m9 (3m9)2 m 1 m2y2 my

8、a2a7 a94x y 6yx2y x2y 5 13p a 3p an9 6 n n 8m 6m 6m m4 m4 m4 2 49c2d2 7c2d b b 6b7 (6b7)2 x 3 x2y2 xy mm4 m2 x y 5xx3y x3y 3 4 x b x bb6 6 b b 5a 7a 5a a1 a1 a1 3 12cd 4cd2 b b 2b4 (2b4)2 a 6 a2n2 an x2x1 x95x2y 2yx2y3 x2y3 4 23m2b 3m2bb3 2 b b 5x x 7x x7 x7 x7 4 28c2d 8c2d 8a 2a 4a6 (4a6)2 x 4 x2b2

9、 xb x2x8 x1 x y 7yx3y2 x3y2 2 42m3b 2m3bx1 6 x x 9m 8m m m7 m7 m7 4 39cd 6cd y y 6y7 (6y7)2 b 1 m2b2 mb aa7 a13x y 4yx3y3 x3y3 5 1 x3b x3bm1 6 m m x 3x x x2 x2 x2 1 22c2d2 9c2d 3n 5n 2n9 (2n9)2 b 4 m2b2 mb aa3 a34x y 8yx2y2 x2y2 2 12p b 2p bn9 5 n n 5m m m m3 m3 m3 2 17cd2 5cd 7b b 3b5 (3b5)2 m 2 m2

10、b2 mb aa5 a59x y 7xx3y x3y 2 3 m n m ny8 6 y y y 4y y y2 y2 y2 3 24c2d2 5cd 2n 3n 3n7 (3n7)2 x 5 x2b2 xb mm1 m18x6y 6xxy xy 1 52p q 2p qb3 4 b b y 2y 4y y2 y2 y2 1 38c2d 7cd2 8b b 4b3 (4b3)2 a 1 a2n2 an m2m7 m4 x8y 7xxy2 xy2 5 4 y2q y2qa1 9 a a 2m 2m m m4 m4 m4 1 29cd2 5c2d b 8b 6b8 (6b8)2 a 3 a2b2

11、ab mm9 m83x y 7xx3y3 x3y3 1 1 x n x nx1 8 x x 5x x 9x x8 x8 x8 1 34c2d 2cd2 m 8m 2m8 (2m8)2 x 2 x2n2 xn xx6 x9 x y 4xxy xy 1 4 y2b y2bb3 8 b b 3m m 6m m3 m3 m3 2 44cd 4cd2 6m m 3m3 (3m3)2 a 3 a2b2 ab xx4 x8 x y 2yxy3 xy3 2 5 m q m qa1 5 a a y y 5y y2 y2 y2 1 13cd 3c2d2 a a 5a2 (5a2)2 a 2 a2n2 an m2m

12、2 m19x y 2xxy3 xy3 1 43p a 3p an1 2 n n b b 3b b6 b6 b6 1 49cd 2c2d2 m m 4m8 (4m8)2 a 5 a2y2 ay aa9 a79x7y 6yx3y x3y 5 23y b 3y bm7 4 m m 9m m 5m m4 m4 m4 3 38cd 5c2d b 8b 5b5 (5b5)2 n 3 m2n2 mn x2x6 x34x4y 8xxy2 xy2 5 5 m3n m3nm6 5 m m m 8m m m6 m6 m6 2 29cd2 9cd2 8x 4x 3x8 (3x8)2 n 3 a2n2 an xx3 x

13、32x y 3xx2y2 x2y2 1 5 y3b y3by6 1 y y x x 4x x3 x3 x3 2 32c2d 5c2d2 a 9a 2a7 (2a7)2 x 2 x2n2 xn a2a5 a48x y 3yxy xy 4 3 m2b m2ba6 1 a a y y 6y y2 y2 y2 4 17cd 5cd 6x x 6x9 (6x9)2 x 3 x2b2 xb xx1 x32x y 6xx2y2 x2y2 4 42x2b 2x2by8 7 y y 5y y 7y y3 y3 y3 1 34c2d 8cd2 b 2b 3b4 (3b4)2 m 6 m2n2 mn x2x6 x29x y 2xx2y x2y 4 12m2a 2m2ay6 8 y y 3b 6b b b2 b2 b2 4 39c2d2 2cd2 m m 4m2 (4m2)2 b 5 a2b2 ab x2x2 x7