人教版八年级数学上册分式的加减法练习题精选15.docx

1、人教版八年级数学上册分式的加减法练习题精选15x y 5xx2y2 x2y2 1 12x3b 2x3bn4 2 n n x x x x9 x9 x9 2 19c2d 4cd2 5a a 5a8 (5a8)2 x 5 x2n2 xn mm7 m9 x6y 7yxy xy 1 12y b 2y ba7 1 a a m m 9m m9 m9 m9 1 29cd2 8c2d 7m 6m 5m5 (5m5)2 x 4 x2b2 xb aa4 a5 x2y 9xx2y2 x2y2 2 1 y n y na1 5 a a n n n n2 n2 n2 4 35c2d2 5cd 3b 5b 5b2 (5b2)

2、2 m 4 m2y2 my x2x6 x97x9y 3yx2y2 x2y2 4 1 m3b m3ba1 9 a a 2n 2n 9n n1 n1 n1 1 28cd2 9c2d 2n 2n 4n7 (4n7)2 m 1 m2b2 mb a2a8 a5 x y 2xxy2 xy2 4 2 y3q y3qb6 1 b b b 2b 2b b5 b5 b5 2 12c2d 5c2d2 b 5b 3b1 (3b1)2 b 4 x2b2 xb xx9 x8 x9y 3yx3y2 x3y2 4 5 x n x na6 8 a a 2n 2n n n2 n2 n2 4 33c2d2 3cd 3b b 3b7

3、 (3b7)2 n 3 a2n2 an aa9 a29x y 7yx3y3 x3y3 2 13m b 3m bb5 5 b b a a a a2 a2 a2 4 34c2d 9c2d n n 2n7 (2n7)2 a 4 a2n2 an mm9 m2 x3y 3yxy2 xy2 2 5 x3a x3am7 4 m m 9n 6n n n3 n3 n3 3 29cd 3c2d 3y 5y 5y7 (5y7)2 m 3 m2n2 mn xx4 x7 x6y 5xx3y3 x3y3 3 42y2q 2y2qm2 8 m m y 9y y y8 y8 y8 1 13cd2 3c2d2 b b 6b4

4、(6b4)2 b 6 m2b2 mb m2m8 m35x y 5xx3y2 x3y2 2 12y3n 2y3nn7 1 n n a a a a8 a8 a8 3 38c2d2 9c2d2 b b 4b4 (4b4)2 x 5 x2b2 xb aa1 a6 x2y 4xxy2 xy2 5 2 p2a p2am5 1 m m x 8x 5x x2 x2 x2 1 25c2d 5cd2 x x 4x1 (4x1)2 x 2 x2n2 xn aa6 a83x y 2yx3y3 x3y3 1 1 x2a x2an4 8 n n b 4b b b9 b9 b9 4 35c2d 9cd a 5a 5a6 (

5、5a6)2 x 2 x2b2 xb aa2 a57x3y 2xx2y3 x2y3 3 2 y q y qn4 9 n n a a 3a a9 a9 a9 2 12cd2 3c2d 3m 3m 2m8 (2m8)2 a 6 a2b2 ab m2m7 m2 x y 5yxy2 xy2 2 53p3q 3p3qb4 9 b b b b 3b b2 b2 b2 2 46c2d2 2cd2 4b 9b 4b9 (4b9)2 x 3 x2n2 xn mm2 m1 x8y 8xx3y x3y 5 5 x b x by7 1 y y 4a a 8a a7 a7 a7 3 44c2d2 6c2d2 3n n 2

6、n5 (2n5)2 m 1 m2n2 mn aa6 a29x3y 5yx3y3 x3y3 5 5 m q m qa5 2 a a y 6y 6y y2 y2 y2 3 37c2d 7c2d2 3a 2a 3a2 (3a2)2 x 2 x2y2 xy xx9 x54x y 4xxy xy 3 52x2a 2x2ax7 6 x x 9x 6x x x9 x9 x9 3 43c2d2 8c2d2 b 8b 2b9 (2b9)2 m 6 m2b2 mb a2a8 a6 x8y 8xx2y3 x2y3 2 5 x q x qx4 3 x x x 5x 3x x3 x3 x3 1 18c2d2 4cd 4

7、a 8a 4a2 (4a2)2 m 6 m2b2 mb a2a7 a6 x y 4xxy2 xy2 4 3 m2n m2nb1 7 b b y y 4y y5 y5 y5 4 13c2d 9cd2 3y 4y 2y2 (2y2)2 x 5 x2b2 xb mm3 m5 x3y 4xxy2 xy2 5 5 y b y bn4 3 n n x x 9x x5 x5 x5 2 29c2d2 9cd b b 3b8 (3b8)2 n 3 m2n2 mn a2a7 a18x y 6xx2y3 x2y3 1 12m2n 2m2nx2 8 x x 6a a 9a a2 a2 a2 4 34c2d2 4c2d

8、2 y y 6y8 (6y8)2 x 3 x2b2 xb x2x7 x77x y 9yxy3 xy3 2 1 x2b x2bb5 1 b b 3y 9y y y3 y3 y3 2 25cd 6cd2 x x 3x8 (3x8)2 m 6 m2n2 mn mm9 m3 x y 6yxy xy 1 23m a 3m ab8 5 b b 2b b 3b b6 b6 b6 2 33cd 7cd a 6a 6a8 (6a8)2 y 6 x2y2 xy x2x6 x7 x9y 4xx2y2 x2y2 1 1 m n m nm7 8 m m 2x x x x7 x7 x7 1 18cd2 8c2d n n

9、4n8 (4n8)2 a 2 a2n2 an xx9 x3 x5y 9yx3y x3y 3 32y3b 2y3bx8 8 x x 5y 6y 2y y4 y4 y4 2 22cd2 7cd2 4m m 2m6 (2m6)2 a 6 a2n2 an x2x4 x67x3y 9xxy xy 2 3 p b p bn7 4 n n 9a 8a 7a a8 a8 a8 2 45cd 6cd2 2b b 2b6 (2b6)2 m 4 m2n2 mn xx5 x7 x3y 9xx3y2 x3y2 5 1 m a m aa7 4 a a 9x x 4x x3 x3 x3 3 28c2d 5cd x 8x 3

10、x3 (3x3)2 y 6 x2y2 xy m2m6 m65x5y 9xxy xy 5 23y2q 3y2qm5 4 m m 7a 7a a a1 a1 a1 2 35cd 5c2d2 y y 2y1 (2y1)2 a 1 a2n2 an x2x8 x56x y 6yx2y3 x2y3 4 23m3q 3m3qy6 5 y y m m m m1 m1 m1 1 45c2d2 7c2d x 8x 2x8 (2x8)2 a 3 a2b2 ab aa6 a29x y 4xx2y x2y 2 22x3b 2x3bx4 1 x x 5a 2a a a2 a2 a2 1 24c2d2 6c2d2 m m

11、5m3 (5m3)2 m 1 m2y2 my a2a9 a8 x y 9xxy3 xy3 5 42m3q 2m3qm3 4 m m y y y y6 y6 y6 2 29c2d 4cd b b 3b8 (3b8)2 m 6 m2n2 mn aa7 a6 x y 3yxy3 xy3 1 1 m n m nm1 2 m m n n n n7 n7 n7 3 34c2d 4c2d2 3m 6m 4m3 (4m3)2 a 2 a2n2 an xx8 x7 x4y 8xx2y3 x2y3 5 2 x a x am4 6 m m 7b b 7b b2 b2 b2 4 33c2d 8cd2 5a 3a 4a

12、8 (4a8)2 x 4 x2n2 xn xx8 x82x7y 9yxy3 xy3 2 3 y3n y3na5 9 a a 6x x x x5 x5 x5 1 44cd 2cd 2y y 5y4 (5y4)2 a 2 a2n2 an xx8 x76x8y 4xx2y3 x2y3 2 52p3a 2p3aa9 4 a a a 2a 6a a2 a2 a2 3 12c2d2 3cd2 3a a 6a6 (6a6)2 y 5 x2y2 xy mm6 m5 x y 8xxy3 xy3 1 1 m b m bb1 2 b b 6x 4x x x2 x2 x2 2 48cd 9cd2 m m 4m9 (4

13、m9)2 x 4 x2b2 xb m2m8 m75x9y 9yx3y x3y 1 22x3q 2x3qa8 5 a a n 9n n n3 n3 n3 3 34c2d2 8c2d2 9n n 3n9 (3n9)2 m 3 m2n2 mn m2m8 m46x y 3xx2y2 x2y2 5 5 m a m ax8 5 x x y y 4y y6 y6 y6 1 37c2d 9c2d 4a 7a 4a9 (4a9)2 a 2 a2n2 an x2x4 x1 x y 8xx3y x3y 3 5 m a m am9 9 m m m m m m7 m7 m7 4 42c2d2 2c2d2 2m m 4m2 (4m2)2 m 1 m2n2 mn a2a1 a62x y 9yxy2 xy2 3 2 p a p ax9 3 x x b 3b 5b b3 b3 b3 3 48c2d 5cd m 8m 4m7 (4m7)2 b 5 m2b2 mb mm5 m3