1、(xy8y27)(x2xy9y28) 5 4 1 3(xyy)(xyx5) 5 4(5y9x7z2)(8y3x z2) (2m23m5)(9m5n7) ( x27x7)9(7x23x) 9(x28)2(x25) (x2y6xy4)5(x2y3xy2) 1 1(x214x15y)(x212x23y) 4 4(7k36k28)(8k3 k26k) (3k26k)(2k23k4) (2a27a8b)(3a2 a3b) 3x2(9x28x1)(9x9) y2(2x2y)( x25y2) 1(8x2 xyx)(6x28xy2x) 3 5(xy7y22)(x2xy7y22) 4 6 4 1(xyy)(xy
2、x4) 3 8(4y6x2z2)(6y4x z2) (4m23m4)(5m4n8) (2x24x7)4(7x26x) 6(x24)5(x28) (x2y2xy8)5(x2y4xy2) (x211x16y)(x211x16y) 7 7(8k39k23)(9k39k22k) (8k24k)(6k24k4) (7a27a b)(3a25a8b) 2x2(7x26x6)(5x6) 3y2(7x2y)(9x2 y2) (5x27xyx)(4x27xy5x) (xy8y27)(x2xy9y23) 4 5(xyy)(xyx5) 7 4(6y3x9z2)(7y9x5z2) (5m23m7)( m3n7) (2x22x2)3(7x23x) 4(x23)8(x29) (x2y2xy4)4(x2y8xy2) 8 1(x229x10y)(x219x23y) (7k37k28)(6k35k23k) 2 4(5k24k)(7k27k9) (3a29a6b)(5a27a9b) 3x2(6x2 x7)(7x4) 6y2(6x2y)(4x28y2) (7x26xyx)(3x28xy x) 9 1(xy7y26)(x2xy9y26) 8 5 9 4(xyy)(xyx9) 8 5