人教版八年级数学上册分式的加减法练习题精选39.docx

1、人教版八年级数学上册分式的加减法练习题精选39x y 3xxy3 xy3 5 1 y2n y2nb4 4 b b b 7b b b1 b1 b1 2 29c2d 6c2d2 7b b 3b4 (3b4)2 n 1 m2n2 mn a2a5 a7 x6y 6xx3y2 x3y2 3 2 m2q m2qn4 8 n n 3n n n n9 n9 n9 3 33c2d 5cd2 a 7a 4a9 (4a9)2 b 5 a2b2 ab a2a2 a7 x y 7xx3y3 x3y3 3 22y3b 2y3bn8 9 n n x 3x 7x x2 x2 x2 4 46c2d2 3c2d n n 3n7

2、(3n7)2 m 6 m2y2 my x2x4 x8 x7y 4xx3y x3y 4 1 m2q m2qm6 3 m m 9y y y y4 y4 y4 3 17cd 7cd 5y 3y 5y9 (5y9)2 n 4 m2n2 mn x2x1 x1 x6y 8xx3y2 x3y2 3 13m b 3m bb6 4 b b a a 3a a8 a8 a8 1 35c2d 5cd b 6b 3b4 (3b4)2 y 6 m2y2 my aa6 a67x6y 8yx3y x3y 1 43p b 3p ba8 9 a a y 8y y y6 y6 y6 4 22c2d2 9cd n 9n 2n6 (2

3、n6)2 m 4 m2y2 my a2a4 a6 x3y 6yx3y3 x3y3 3 2 p3b p3bb4 9 b b 9y y 2y y5 y5 y5 2 14c2d 6cd2 m m 5m6 (5m6)2 a 4 a2y2 ay a2a2 a68x y 5yx3y x3y 5 33y3n 3y3nm1 2 m m y y 7y y4 y4 y4 3 19cd2 2c2d2 b b 2b6 (2b6)2 n 4 a2n2 an m2m7 m8 x2y 9yx3y2 x3y2 2 22y2q 2y2qx3 8 x x 2x 2x 9x x8 x8 x8 4 17cd 4cd2 x x 2x9

4、 (2x9)2 m 4 m2n2 mn xx7 x2 x4y 6yx3y x3y 4 5 m q m qb7 1 b b 5b 5b 7b b8 b8 b8 2 37cd2 8cd2 m 3m 4m6 (4m6)2 y 6 m2y2 my x2x7 x27x y 2xx2y2 x2y2 2 5 p2n p2nm5 3 m m 7x 2x x x1 x1 x1 1 29cd2 6cd2 y y 6y4 (6y4)2 x 2 x2n2 xn a2a6 a88x y 6xx3y x3y 2 2 y2n y2na3 9 a a 7m m 4m m4 m4 m4 4 19cd2 8c2d2 7m 9m

5、5m9 (5m9)2 x 6 x2n2 xn mm4 m13x y 7yxy3 xy3 5 12m3b 2m3bn8 5 n n m 6m m m5 m5 m5 3 43cd 3c2d2 5b 3b 2b3 (2b3)2 n 5 a2n2 an mm9 m22x y 9yxy2 xy2 2 1 m b m bb6 8 b b 3b 8b b b4 b4 b4 1 12c2d 6cd2 m m 3m9 (3m9)2 n 1 a2n2 an m2m5 m6 x y 4yx3y2 x3y2 2 1 y a y ax9 3 x x 8y 2y y y3 y3 y3 1 34c2d 5c2d x 8x

6、5x3 (5x3)2 x 3 x2n2 xn a2a5 a4 x3y 7yx2y3 x2y3 1 1 x a x an2 4 n n 6b b b b1 b1 b1 3 32c2d 4cd 3n n 5n7 (5n7)2 x 4 x2n2 xn x2x9 x3 x y 5xxy2 xy2 2 1 x q x qm4 1 m m 2a a 9a a6 a6 a6 2 24cd2 9cd b b 3b1 (3b1)2 b 1 x2b2 xb m2m3 m66x2y 3xx2y3 x2y3 4 4 x b x ba7 6 a a 4a a a a3 a3 a3 3 42c2d 3cd2 y y 2y

7、5 (2y5)2 a 5 a2y2 ay x2x8 x15x3y 5xx3y2 x3y2 1 33p3q 3p3qx5 7 x x 3a a 6a a2 a2 a2 3 29cd2 9cd2 m 6m 5m1 (5m1)2 b 3 a2b2 ab m2m4 m8 x3y 2xx2y2 x2y2 2 12p3q 2p3qx3 1 x x n 7n 8n n9 n9 n9 3 28c2d 5cd2 5y 4y 6y5 (6y5)2 m 2 m2b2 mb m2m2 m86x7y 3xxy2 xy2 3 2 p b p ba9 1 a a 6x x 4x x1 x1 x1 4 32cd2 2c2d2

8、 b b 2b9 (2b9)2 x 4 x2b2 xb xx5 x49x y 9yxy3 xy3 2 5 x a x ax6 2 x x 2m 2m m m6 m6 m6 3 22cd 4c2d x 2x 5x3 (5x3)2 a 6 a2n2 an xx3 x2 x y 4xxy xy 1 22m2b 2m2bm7 1 m m m 5m 9m m8 m8 m8 1 32cd2 7c2d a 5a 3a4 (3a4)2 y 2 a2y2 ay m2m8 m92x5y 5xx2y x2y 3 5 m2n m2nb1 5 b b 3a 8a a a3 a3 a3 4 16cd2 3cd2 x x

9、6x3 (6x3)2 b 3 x2b2 xb x2x8 x7 x y 2xx2y2 x2y2 3 23p a 3p an3 5 n n b b b b4 b4 b4 1 32cd2 5cd 8y y 6y9 (6y9)2 y 3 a2y2 ay xx6 x7 x9y 9yx3y2 x3y2 4 32p n 2p nb4 4 b b m m 7m m1 m1 m1 1 36c2d 6c2d x 5x 5x2 (5x2)2 m 5 m2y2 my x2x8 x62x5y 9yx3y2 x3y2 2 53p3b 3p3bn1 8 n n 2m m m m7 m7 m7 4 19c2d2 8c2d2

10、y 4y 6y2 (6y2)2 n 2 a2n2 an mm5 m12x3y 4xx3y2 x3y2 3 23m n 3m nx8 3 x x m m 2m m3 m3 m3 2 23c2d2 3c2d 2a 6a 3a5 (3a5)2 b 1 x2b2 xb x2x7 x2 x y 3xxy2 xy2 3 1 y q y qx9 2 x x 7x x x x3 x3 x3 2 44cd2 5c2d2 5b 7b 6b9 (6b9)2 m 3 m2n2 mn xx9 x6 x9y 4xxy xy 4 43p3n 3p3nm2 9 m m m m 9m m7 m7 m7 1 28c2d 2cd

11、5x 5x 4x4 (4x4)2 n 3 x2n2 xn m2m4 m6 x5y 3yxy2 xy2 2 2 y a y an4 5 n n 5a a a a1 a1 a1 3 16c2d2 7c2d 7n 4n 5n8 (5n8)2 a 1 a2n2 an x2x4 x68x y 7yx2y x2y 1 32p b 2p bm6 6 m m m m m m6 m6 m6 4 45c2d 9c2d y 8y 3y4 (3y4)2 n 1 a2n2 an xx7 x95x y 7xx2y x2y 2 1 p2a p2ab4 6 b b n 3n n n9 n9 n9 4 28c2d2 4c2d2

12、 b 3b 6b6 (6b6)2 b 2 m2b2 mb mm6 m9 x y 8yxy3 xy3 5 52y2q 2y2qx3 8 x x y 6y y y7 y7 y7 3 36c2d 7c2d n 2n 2n8 (2n8)2 n 4 x2n2 xn mm9 m57x y 7yxy xy 1 33m2b 3m2bn1 4 n n y y 9y y8 y8 y8 4 36cd 6cd2 9b b 6b6 (6b6)2 a 3 a2y2 ay mm6 m1 x y 7xx2y3 x2y3 1 12m2n 2m2na6 7 a a x 2x 6x x7 x7 x7 2 15cd 2c2d2 8n

13、 4n 6n3 (6n3)2 n 6 x2n2 xn a2a1 a4 x5y 3yx2y3 x2y3 4 33p q 3p qn4 7 n n x 7x 6x x6 x6 x6 1 29c2d2 4cd b b 6b6 (6b6)2 y 4 m2y2 my aa9 a45x y 6xx3y2 x3y2 3 4 m n m nm9 9 m m x x 3x x2 x2 x2 1 15cd 5c2d2 9x x 3x1 (3x1)2 b 3 x2b2 xb a2a4 a23x y 2yxy xy 5 1 y3b y3bn5 6 n n 6b 5b 4b b8 b8 b8 4 37cd 8cd 9x 6x 5x3 (5x3)2 n 3 a2n2 an m2m3 m1 x6y 5yxy xy 4 13y n 3y nm7 1 m m m 7m 4m m6 m6 m6 4 24cd2 2c2d 2x x 5x7 (5x7)2 n 4 x2n2 xn m2m4 m8