1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y

来源：学生作业帮编辑：灵鹊做题网作业帮分类：数学作业时间：2024/05/02 16:35:12

1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y)]÷4y 3)
整式乘除 3）（a+b)^2-2a(b+1)-a^2b÷ab 4）（a^2+3)(a-3)-a(a^2-2a-2）

1)
(2x+5y)(2x-5y)(-4x^2-25y^2)
=-(4x^2-25y^2)(4x^2+25y^2)
=-(16x^4-625y^4)
=625y^4-16x^4
2)
[（x+y)(x-y)-(x-y)^2+2y(x-y)]÷4y
=(x-y)(x+y-x+y+2y)÷4y
=4y(x-y)÷4y^
=(x-y)
3）
（a+b)^2-2a(b+1)-a^2b÷ab
=a^2+2ab+b^2-2ab-2a-a
=a^2+b^2-3a
4）
（a^2+3)(a-3)-a(a^2-2a-2)
=a^3-3a^2+3a-9-a^3+2a^2+2a
=5a-a^2-9

1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 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 （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) 数学(x-y)^5*(y-x)^3*(x-y)^2 x^2-y^2/x+y-4x(x-y)+y^2/2x-y, 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) （X+2Y)(5X-2Y) 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 (2X-3y)-(5x-y) 【(x-y)^2+(x+y)(x-y)】除以 2x