(1).(x-2y)(x+2y)-(x+2y)^2

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/05/25 00:06:02

(1).(x-2y)(x+2y)-(x+2y)^2
(2).(2a+1)^2-(1-2a)^2
(3).(3x-y)^2-(2x+y)^2+5x(y-x)

(1).(x-2y)(x+2y)-(x+2y)^2
=[x^2-(2y)^2]-(x^2+4xy+4y^2)
=x^2-4y^2-x^2-4xy-4y^2
=-4xy-8y^2
(2).(2a+1)^2-(1-2a)^2
=[(2a+1)+(1-2a)][(2a+1)-(1-2a)]
=(2a+1+1-2a)(2a+1-1+2a)
=2*4a
=8a
(3).(3x-y)^2-(2x+y)^2+5x(y-x)
=[(3x-y)+(2x+y)][(3x-y)-(2x+y)]+5x(y-x)
=(3x-y+2x+y)(3x-y-2x-y)+5x(y-x)
=5x*(x-2y)+5x(y-x)
=5x(x-2y+y-x)
=5x(-y)
=-5xy

1、x(x-y)(x+y)-x(x+y)^2 (1)(x^2/x)-y-x-y [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y (1)(x+y)^2-(x-y)^2 1、(x-2y)(x+y) 【(x-y)^2+(x+y)(x-y)】除以 2x 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)( 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y x^2-y^2/x+y-4x(x-y)+y^2/2x-y, (x+y)^2(x-y)^2-(x-y)(x+y)(x^2+y^2)分解因式化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方