七年级数学下册计算题19.docx

1、七年级数学下册计算题19 (5k26k)(5k25k2) (2a2 a6b)(4a29a4b) 7x2(6x29x3)(6x8) 5y2(8x2y)(9x25y2) 1(5x25xyx)( x27xy6x) 3 7 1(xy9y24)(x2xy3y29) 8 7 3 1(xyy)(xyx2) 4 4 ( y x5z2)(9y x4z2) (2k25k)(3k24k6) (8a24a2b)(7a22a3b) x2(2x25x4)(5x7) 8y2(9x2y)(2x28y2) 6(7x28xyx)(3x2 xy8x) 7 8 6(xy y27)(x2xy4y24) 7 5 1 4(xyy)(xyx

2、9) 3 3 (8y3x8z2)(5y7x7z2) (9k22k)(2k22k3) (3a2 a6b)(9a28a7b) x2(5x23x7)(2x7) 8y2(2x2y)(3x22y2) 7(2x23xyx)(2x28xy6x) 6 1 1(xy4y24)(x2xy3y23) 8 8 7 3(xyy)(xyx1) 8 4 ( y6x z2)(5y7x7z2) (8k29k)(2k28k2) (8a23a3b)(8a22a6b) 7x2(4x28x9)(3x9) 5y2(3x2y)(9x2 y2) 1(7x24xyx)( x27xy3x) 6 5 7(xy5y26)(x2xy7y24) 6 6

3、 8 9(xyy)(xyx4) 7 8 ( y7x7z2)(4y4x9z2) (4k28k)(2k28k3) (6a28a8b)(6a29a4b) 3x2(8x22x8)(4x7) 4y2(4x2y)(6x25y2) 6(9x28xyx)(6x27xy7x) 5 1 3(xy5y25)(x2xy6y23) 7 4 2 6(xyy)(xyx4) 3 7 (4y2x7z2)(8y3x7z2) (8k23k)(4k2 k8) (7a25a3b)(3a2 a3b) x2(3x22x1)(2x8) 3y2(6x2y)(2x28y2) 1(5x23xyx)(5x23xy3x) 6 1 1(xy4y23)(

4、x2xy4y22) 4 6 1 1(xyy)(xyx9) 4 7 (7y4x6z2)(4y4x7z2) (6k22k)(4k23k1) (5a24a7b)(6a29a7b) 6x2( x23x6)(4x8) 7y2(6x2y)(7x28y2) 4(2x24xyx)(6x28xy x) 5 5 2(xy7y25)(x2xy4y23) 4 3 1 4(xyy)(xyx4) 7 3 (5y7x4z2)(9y2x5z2) (6k22k)(5k25k1) (7a22a4b)(2a28a4b) 6x2( x23x8)(8x5) 7y2(6x2y)(2x24y2) 7(8x25xyx)(3x28xy2x)

5、6 4 5(xy4y29)(x2xy3y25) 5 6 4 1(xyy)(xyx8) 3 8 (6y x8z2)(8y5x8z2) (4k29k)(7k25k1) ( a22a8b)(7a28a2b) 6x2(2x29x5)(4x9) 2y2(6x2y)(8x29y2) 1(6x23xyx)(6x22xy6x) 5 5 6(xy y23)(x2xy4y27) 4 5 2 1(xyy)(xyx7) 3 3 (7y2x z2)(5y7x8z2) (9k27k)(5k23k5) (8a29a b)(7a22a2b) 6x2(5x29x4)(5x5) 6y2( x2y)(8x29y2) 4(4x28x

6、yx)(2x2 xy x) 5 7 1(xy y24)(x2xy2y21) 6 8 4 5(xyy)(xyx2) 5 4 (9y2x8z2)(2y4x8z2) (3k24k)(8k29k4) (8a23a b)(9a22a5b) 8x2(3x24x3)(9x8) 7y2(9x2y)(8x29y2) 3(9x27xyx)(6x25xy9x) 4 1 1(xy3y29)(x2xy2y29) 8 3 3 1(xyy)(xyx5) 4 8 (9y4x2z2)(2y9x7z2) (3k23k)(5k24k5) (5a24a2b)(7a24a3b) x2(4x24x1)(6x3) 3y2(7x2y)( x

7、23y2) 5(5x29xyx)(6x22xy x) 4 1 4(xy6y21)(x2xy6y21) 5 5 7 1(xyy)(xyx8) 6 8 (5y9x7z2)(7y7x9z2) (9k25k)(3k26k9) (9a25a7b)(8a24a2b) 6x2(7x28x8)(4x7) 9y2(7x2y)( x27y2) 1(6x25xyx)(6x28xy9x) 5 7 2(xy9y27)(x2xy4y26) 6 3 1 2(xyy)(xyx6) 6 3 (2y x5z2)(4y4x3z2) (2k26k)(8k2 k3) (8a23a b)(5a29a6b) 5x2(7x28x9)(8x5

8、) 4y2(8x2y)(3x22y2) 9(3x24xyx)( x25xy6x) 8 6 9(xy4y24)(x2xy4y22) 7 8 1 1(xyy)(xyx2) 6 3 (9y5x z2)(3y7x8z2) (5k2 k)(9k26k2) (4a27a7b)( a22a9b) 3x2(8x23x5)(5x1) 3y2( x2y)(8x29y2) 2(4x29xyx)(5x29xy8x) 3 7 7(xy9y21)(x2xy6y26) 6 8 7 2(xyy)(xyx8) 6 3 ( y x9z2)( y2x4z2) (7k2 k)(6k29k1) (9a28a6b)(9a22a3b) 2

9、x2(8x28x9)(3x9) 4y2(4x2y)(2x25y2) 7(3x26xyx)(4x28xy x) 8 4 1(xy5y22)(x2xy3y23) 5 3 1 1(xyy)(xyx4) 4 7 (7y6x z2)(6y3x2z2) (5k26k)( k24k1) (3a27a4b)(5a26a7b) 4x2(5x28x3)(7x8) 4y2(7x2y)(5x24y2) 1(9x23xyx)(9x28xy9x) 8 2 1(xy9y25)(x2xy2y24) 3 7 5 2(xyy)(xyx6) 6 3 (8y x4z2)(2y4x5z2) (3k27k)(7k2 k3) (9a23a

10、 b)(9a27a9b) 9x2(9x22x4)(2x1) 7y2(8x2y)(6x23y2) 1(8x28xyx)(7x22xy x) 8 6 9(xy6y26)(x2xy7y26) 5 8 7 1(xyy)(xyx8) 6 6 (9y6x3z2)(9y5x z2) ( k22k)(8k23k4) (7a28a4b)(2a22a6b) 2x2( x24x4)(6x5) y2(3x2y)(3x25y2) 7(3x28xyx)(8x24xy x) 8 6 9(xy6y25)(x2xy9y24) 5 8 1 6(xyy)(xyx9) 5 7 (2y3x3z2)(4y x7z2) (3k2 k)(5

11、k23k4) (6a27a6b)(7a23a3b) 6x2(6x23x1)(3x6) 9y2(5x2y)(4x28y2) 1(6x22xyx)( x26xy9x) 8 1 1(xy9y27)(x2xy9y28) 8 3 2 1(xyy)(xyx6) 3 6 (3y4x4z2)(3y6x9z2) (8k27k)(2k27k9) ( a29a9b)(9a26a6b) 5x2(9x23x3)( x5) y2(6x2y)(2x26y2) 6(5x22xyx)(5x22xy8x) 5 1 7(xy8y23)(x2xy8y28) 4 8 8 9(xyy)(xyx6) 7 8 (4y2x3z2)(8y x5

12、z2) (8k2 k)(6k2 k7) (7a2 a7b)(3a27a2b) 9x2(9x27x6)(5x4) 4y2(3x2y)(8x29y2) 6(5x24xyx)( x29xy5x) 5 2 4(xy5y23)(x2xy6y28) 3 5 1 1(xyy)(xyx8) 8 5 (4y2x9z2)( y2x3z2) (5k27k)(7k28k7) (4a28a2b)(4a23a2b) 6x2(5x28x4)(7x4) 6y2(2x2y)(2x22y2) 7(4x25xyx)(6x26xy9x) 8 4 1(xy3y29)(x2xy y22) 3 6 7 1(xyy)(xyx2) 8 6 (

13、8y3x4z2)(3y3x7z2) (8k25k)(2k28k1) ( a22a5b)(7a24a7b) 3x2(9x29x8)( x1) y2(4x2y)(5x26y2) 1(3x22xyx)( x22xy7x) 7 1 4(xy7y23)(x2xy7y26) 8 3 5 4(xyy)(xyx4) 4 3 (3y x5z2)(3y x3z2) (8k22k)(9k24k3) (6a25a6b)( a24a8b) 9x2(8x27x7)(8x2) 4y2(8x2y)( x25y2) 2(4x23xyx)(9x24xy4x) 3 8 1(xy6y21)(x2xy3y21) 7 7 1 5(xyy)(xyx5) 8 6 (5y2x z2)(3y x4z2)