人教版八年级数学上册分式的加减法练习题4.doc

1、x y 8xx3y3 x3y3 2 23y2a 3y2ay7 4 y y x x 7x x5 x5 x5 1 22c2d 8cd2 4a 8a 2a3 (2a3)2 y 1 m2y2 my a2a4 a7 x9y 4yxy2 xy2 5 52p b 2p bn8 3 n n 4y 3y 4y y4 y4 y4 1 39cd 5c2d2 8n 8n 4n8 (4n8)2 y 1 x2y2 xy a2a8 a6 x y 5xx2y3 x2y3 5 5 m2b m2bn2 9 n n 7m m 9m m4 m4 m4 3 26c2d2 5cd y y 2y1 (2y1)2 y 3 m2y2 my m

2、2m7 m7 x3y 6yx2y2 x2y2 5 22y n 2y na3 5 a a 2n 6n 7n n5 n5 n5 1 35cd 6c2d y 6y 2y9 (2y9)2 y 1 a2y2 ay aa1 a48x9y 9yx2y2 x2y2 4 3 p n p ny8 4 y y y y y y8 y8 y8 1 32c2d 5c2d2 8m m 6m6 (6m6)2 n 5 a2n2 an m2m5 m53x8y 5xx2y3 x2y3 4 1 x q x qx8 2 x x 5a a a a7 a7 a7 2 39cd2 8c2d2 y y 4y2 (4y2)2 a 6 a2n2

3、an a2a2 a72x y 4xx2y3 x2y3 5 2 p b p bx4 1 x x 3n n 5n n7 n7 n7 1 36cd 3cd a 7a 3a3 (3a3)2 y 6 m2y2 my mm6 m7 x y 5yxy xy 1 4 m q m qn2 1 n n 2n 9n 2n n5 n5 n5 4 27c2d2 5c2d 3n n 6n1 (6n1)2 b 4 x2b2 xb mm3 m3 x y 6yxy3 xy3 3 2 x b x bx5 1 x x m m m m1 m1 m1 2 13c2d2 7c2d 2y 2y 2y4 (2y4)2 b 6 m2b2 mb

4、 aa5 a9 x8y 2yxy3 xy3 1 42p3b 2p3bm7 1 m m 4y 6y 9y y7 y7 y7 4 13c2d2 2cd n 9n 4n3 (4n3)2 a 5 a2y2 ay m2m3 m3 x5y 7xxy xy 1 2 m3q m3qm8 4 m m a 9a 6a a5 a5 a5 3 28cd2 4cd 9b 2b 4b8 (4b8)2 b 3 a2b2 ab a2a7 a2 x3y 6yxy3 xy3 4 53p2a 3p2ay1 3 y y x 4x 8x x8 x8 x8 2 28c2d 7c2d 7b b 3b8 (3b8)2 b 6 x2b2 xb

5、 xx2 x7 x y 9xxy2 xy2 3 52m3b 2m3bm7 3 m m n n n n3 n3 n3 4 28c2d2 5cd2 6m m 4m8 (4m8)2 x 5 x2y2 xy xx1 x7 x y 4yx2y x2y 3 4 p a p am8 4 m m b 7b 4b b4 b4 b4 3 36c2d 9cd2 n n 6n8 (6n8)2 a 5 a2n2 an x2x3 x6 x4y 9yx3y2 x3y2 1 23m3a 3m3ax4 2 x x 6y 4y 2y y9 y9 y9 2 19cd 5cd m 8m 3m1 (3m1)2 x 2 x2b2 xb

6、aa9 a58x2y 4xxy2 xy2 2 3 x3b x3bn5 4 n n 7m m 6m m9 m9 m9 1 45cd2 2cd 9a 8a 3a2 (3a2)2 n 1 m2n2 mn a2a1 a67x7y 8xx3y2 x3y2 3 5 x n x nx9 7 x x b 7b 2b b9 b9 b9 3 44cd 5c2d 8y y 3y6 (3y6)2 n 5 a2n2 an x2x6 x96x3y 3xx2y3 x2y3 2 22m q 2m qy5 6 y y 6n 3n 6n n7 n7 n7 1 46cd 2cd2 a 8a 3a9 (3a9)2 y 5 m2y2

7、my aa5 a2 x y 7yx3y3 x3y3 3 42x b 2x bn4 7 n n 3n 3n 6n n3 n3 n3 4 13cd2 8c2d2 b b 3b6 (3b6)2 b 4 m2b2 mb xx2 x82x5y 9xxy2 xy2 3 4 x n x nx4 7 x x y y 3y y2 y2 y2 1 35cd 8cd 8n 3n 6n9 (6n9)2 n 1 a2n2 an a2a7 a76x4y 5yx2y2 x2y2 1 22m2q 2m2qx7 5 x x n 9n n n8 n8 n8 4 38cd 6cd2 y y 6y3 (6y3)2 b 2 x2b2

8、xb m2m2 m1 x y 4xxy xy 5 12x2q 2x2qa5 6 a a 7b b 5b b9 b9 b9 3 33c2d2 4c2d2 3a 7a 4a1 (4a1)2 b 1 m2b2 mb xx3 x1 x y 5yx3y2 x3y2 4 12y n 2y nx3 9 x x b b b b2 b2 b2 4 17c2d 3cd2 y 8y 6y3 (6y3)2 y 3 m2y2 my mm5 m6 x8y 7xx3y x3y 3 12m q 2m qb8 8 b b y y y y6 y6 y6 2 37cd2 6cd2 y 9y 6y3 (6y3)2 b 6 x2b2

9、xb a2a1 a46x y 6xx3y2 x3y2 3 32p3q 2p3qb5 4 b b n 6n 8n n6 n6 n6 2 42c2d2 3cd 8b 3b 4b1 (4b1)2 m 3 m2b2 mb x2x3 x7 x9y 8xx3y x3y 2 5 p b p bm5 9 m m 4a a 6a a3 a3 a3 2 35c2d2 7c2d2 2n n 6n9 (6n9)2 x 3 x2b2 xb xx6 x8 x y 6xx3y2 x3y2 4 1 y2n y2nb9 7 b b n 8n n n3 n3 n3 3 24cd 5c2d 3x x 4x2 (4x2)2 n 3

10、a2n2 an a2a8 a3 x7y 3yx3y2 x3y2 1 23p q 3p qn8 6 n n y 3y y y8 y8 y8 1 35cd2 8cd 5y y 4y3 (4y3)2 m 1 m2n2 mn x2x8 x94x y 2xx3y2 x3y2 4 5 m q m qn1 7 n n 2n 9n n n3 n3 n3 1 36c2d 5c2d x 2x 6x4 (6x4)2 n 5 m2n2 mn xx3 x4 x y 6xx2y3 x2y3 1 43y2q 3y2qy3 6 y y 4y y 5y y8 y8 y8 2 22cd2 7c2d2 5a 9a 2a9 (2a9

11、)2 x 5 x2b2 xb a2a5 a63x y 6xxy3 xy3 1 22m3b 2m3by1 1 y y 8m m 4m m7 m7 m7 4 13c2d 6cd2 7x x 4x5 (4x5)2 m 6 m2y2 my aa3 a9 x5y 9yx3y3 x3y3 3 1 x a x aa7 6 a a 6x 6x x x2 x2 x2 3 19c2d 2c2d2 4a a 2a4 (2a4)2 y 1 a2y2 ay m2m7 m4 x9y 9xxy3 xy3 2 52m n 2m nx8 3 x x x x x x1 x1 x1 1 43c2d2 4c2d x 6x 6x2 (

12、6x2)2 n 2 m2n2 mn x2x7 x34x8y 9yx3y x3y 2 4 y q y qa5 1 a a 6y 7y y y9 y9 y9 1 43c2d 5cd2 a 2a 3a7 (3a7)2 m 5 m2n2 mn x2x1 x7 x5y 8yx3y x3y 3 3 y n y nx2 1 x x 5b b b b9 b9 b9 1 23c2d2 8c2d m 7m 6m3 (6m3)2 m 5 m2b2 mb a2a5 a59x3y 5xx3y2 x3y2 2 4 y3b y3bm3 7 m m b 5b 9b b8 b8 b8 1 17c2d 9c2d a 9a 2a7

13、 (2a7)2 y 2 x2y2 xy a2a5 a55x y 2yx2y x2y 4 33m a 3m an2 6 n n 4b b 3b b4 b4 b4 2 36c2d2 8c2d y y 2y9 (2y9)2 y 1 m2y2 my m2m3 m46x5y 2xxy2 xy2 5 5 p q p qy8 6 y y 8a 9a a a7 a7 a7 3 15cd 9c2d2 x 9x 2x8 (2x8)2 b 6 a2b2 ab xx8 x22x y 8xxy2 xy2 3 5 p2a p2an9 7 n n x x 7x x9 x9 x9 1 32cd 3cd2 n 5n 2n2 (2n2)2 b 4 x2b2 xb aa5 a28x4y 4xxy2 xy2 1 1 x2a x2aa4 1 a a 4x x x x6 x6 x6 3 49c2d 7cd2 4n n 6n3 (6n3)2 x 2 x2y2 xy a2a2 a9