人教版八年级数学上册分式的加减法练习题精选55.docx

1、人教版八年级数学上册分式的加减法练习题精选55x y 3xxy3 xy3 5 2 x a x an8 7 n n a 6a 7a a2 a2 a2 4 23cd2 6cd 3a 4a 6a6 (6a6)2 a 4 a2y2 ay x2x2 x38x9y 2xxy3 xy3 2 22p q 2p qx4 8 x x x 2x 5x x6 x6 x6 1 28cd 6c2d2 8n n 4n9 (4n9)2 a 5 a2n2 an aa4 a6 x7y 8xxy xy 4 5 m b m bx9 2 x x a a 4a a7 a7 a7 1 16c2d 4cd 6n 4n 4n4 (4n4)2

2、b 4 a2b2 ab xx7 x9 x y 3xx3y3 x3y3 3 32y a 2y aa9 9 a a 4n n n n4 n4 n4 2 45cd2 2c2d b 6b 2b2 (2b2)2 n 2 m2n2 mn a2a4 a32x7y 2xx2y2 x2y2 1 1 p b p by9 4 y y 8m 8m m m2 m2 m2 4 17c2d2 7cd b 5b 3b9 (3b9)2 n 3 a2n2 an a2a9 a17x y 5xx3y x3y 4 13m2a 3m2ay6 8 y y 2a 4a a a1 a1 a1 2 47c2d2 3cd 3b 8b 5b1 (5

3、b1)2 x 3 x2n2 xn aa5 a37x y 8yxy3 xy3 4 3 x3b x3ba7 4 a a 8m m 9m m3 m3 m3 2 16cd2 9cd 4y 7y 6y4 (6y4)2 a 1 a2b2 ab xx4 x52x y 2yx3y3 x3y3 1 13m a 3m ax6 4 x x 5b b 7b b9 b9 b9 3 17c2d2 5c2d 7a a 6a9 (6a9)2 y 5 m2y2 my x2x8 x29x5y 7xxy3 xy3 3 53x b 3x bn8 4 n n a a a a4 a4 a4 2 39cd2 8cd2 4a a 4a6 (

4、4a6)2 m 2 m2y2 my mm2 m74x y 7xx2y3 x2y3 5 2 y q y qb4 4 b b a 9a 8a a7 a7 a7 4 33cd2 5c2d2 3b 2b 6b8 (6b8)2 n 5 a2n2 an mm9 m92x5y 7xx2y x2y 4 43y2a 3y2aa4 8 a a m m 8m m2 m2 m2 3 23cd2 4cd m m 2m8 (2m8)2 x 1 x2n2 xn mm5 m17x7y 2xx2y x2y 4 3 x b x bx4 5 x x n n n n4 n4 n4 4 27cd 4c2d 6a a 5a1 (5a1)

5、2 x 2 x2b2 xb aa3 a5 x5y 9xxy2 xy2 1 2 m2a m2ay6 6 y y b b 3b b3 b3 b3 3 16cd2 7cd2 a a 6a8 (6a8)2 y 5 a2y2 ay x2x2 x43x y 8xxy2 xy2 1 32p2n 2p2ny7 5 y y 6m m m m4 m4 m4 4 26cd2 7cd a a 5a4 (5a4)2 y 6 m2y2 my mm7 m2 x y 7yxy2 xy2 2 52p q 2p qn8 6 n n 5n 2n n n9 n9 n9 2 36cd 8c2d2 m m 2m2 (2m2)2 a 3

6、a2n2 an x2x1 x9 x8y 2yx3y3 x3y3 2 13x3n 3x3nb4 8 b b 4n n n n9 n9 n9 3 29cd2 4c2d 7n 4n 4n8 (4n8)2 a 3 a2b2 ab x2x2 x64x8y 8xx3y3 x3y3 5 3 y a y am7 9 m m n n n n1 n1 n1 2 27cd2 7c2d2 y y 6y7 (6y7)2 x 2 x2b2 xb x2x7 x7 x y 6yxy2 xy2 1 3 x3n x3na5 1 a a y y 7y y4 y4 y4 3 38c2d 3cd b 5b 2b9 (2b9)2 b 6

7、 x2b2 xb aa5 a7 x y 3xx3y3 x3y3 1 43p2q 3p2qn7 8 n n 4b 3b 7b b2 b2 b2 3 29c2d 8c2d y 3y 6y4 (6y4)2 n 2 a2n2 an mm9 m86x5y 9xx3y3 x3y3 5 1 x2n x2na1 5 a a 7m 8m 5m m1 m1 m1 1 34c2d 8c2d 2n n 2n9 (2n9)2 b 6 x2b2 xb aa8 a96x3y 7xx3y3 x3y3 3 12y3q 2y3qx2 4 x x 5x x 4x x2 x2 x2 1 37c2d 3c2d a 8a 4a6 (4a

8、6)2 a 2 a2n2 an xx9 x4 x6y 7yx2y2 x2y2 3 3 y3a y3ay4 2 y y y 5y 4y y5 y5 y5 2 15cd2 9cd y 7y 6y1 (6y1)2 y 5 a2y2 ay mm2 m17x y 2yx3y3 x3y3 1 53y3a 3y3ab9 5 b b x x x x8 x8 x8 4 12cd 8cd2 x 7x 4x7 (4x7)2 b 5 x2b2 xb xx6 x7 x y 4yx2y x2y 1 2 x2n x2ny5 4 y y n n 5n n2 n2 n2 4 49cd 9c2d2 x x 2x1 (2x1)2

9、n 4 x2n2 xn xx3 x72x8y 5xx2y x2y 5 32x3b 2x3bb2 7 b b n n n n7 n7 n7 2 33cd 7c2d a a 6a2 (6a2)2 x 3 x2b2 xb xx2 x2 x7y 7yx3y x3y 3 43x a 3x an8 2 n n 8a 6a a a8 a8 a8 1 43c2d 3cd 6b b 4b4 (4b4)2 m 2 m2y2 my mm4 m1 x y 8xxy3 xy3 1 12x b 2x bm9 9 m m 3x x 6x x7 x7 x7 3 46c2d2 4c2d2 x x 4x3 (4x3)2 b 1

10、m2b2 mb mm6 m9 x8y 5yx3y2 x3y2 1 42m2q 2m2qn9 1 n n y 7y 2y y1 y1 y1 1 44c2d 2cd 7y 4y 4y5 (4y5)2 y 6 m2y2 my a2a3 a59x y 4xxy3 xy3 4 12y2b 2y2by1 1 y y 6x x x x5 x5 x5 2 46c2d2 2cd2 4m m 3m1 (3m1)2 b 1 a2b2 ab mm8 m29x3y 6yx2y2 x2y2 5 1 x3a x3ay6 9 y y 9n 9n n n1 n1 n1 1 25cd 4c2d2 8y y 6y4 (6y4)2

11、a 2 a2y2 ay xx1 x87x y 7xxy xy 1 1 p n p na8 7 a a a a 3a a7 a7 a7 3 42cd2 3cd 4y 4y 5y6 (5y6)2 a 6 a2y2 ay x2x9 x2 x9y 9xx3y x3y 2 5 y3n y3ny8 1 y y 2y y 2y y5 y5 y5 2 42cd 2cd2 7m 5m 2m1 (2m1)2 b 1 a2b2 ab aa7 a46x y 9yx3y3 x3y3 1 23m2a 3m2ax8 9 x x 6a 4a 6a a1 a1 a1 1 25c2d2 4cd a 5a 5a2 (5a2)2 y

12、 4 x2y2 xy xx5 x97x y 8xx2y x2y 1 23m2a 3m2ay9 9 y y 5y 6y 3y y5 y5 y5 4 43c2d 6c2d 8b b 4b8 (4b8)2 n 2 a2n2 an xx5 x63x y 3yx2y2 x2y2 4 3 p3b p3bb4 1 b b 6b 3b b b6 b6 b6 3 22c2d2 7cd x 4x 4x3 (4x3)2 y 5 x2y2 xy mm4 m16x2y 5xx2y2 x2y2 1 53m3b 3m3bb9 9 b b 5a 7a 9a a6 a6 a6 3 43c2d 2cd2 n n 2n2 (2n2

13、)2 b 1 a2b2 ab a2a4 a44x6y 6yxy xy 4 2 y b y ba4 6 a a 3n n 6n n9 n9 n9 1 14c2d 6cd m 7m 5m4 (5m4)2 m 4 m2y2 my xx6 x96x y 8xxy3 xy3 4 43x2b 3x2ba2 7 a a x 4x 9x x3 x3 x3 1 44c2d 5cd 8n n 5n2 (5n2)2 n 4 m2n2 mn mm7 m24x y 3xx3y x3y 5 42m2b 2m2bx3 8 x x y y 7y y5 y5 y5 1 33cd2 6cd2 6a 3a 6a6 (6a6)2 y 3 a2y2 ay m2m9 m2 x2y 6xx2y x2y 3 1 m n m nb7 6 b b 6x x 7x x3 x3 x3 3 25c2d 9c2d x x 3x3 (3x3)2 n 3 a2n2 an xx5 x9