1.(x+2y)^2-4(x-3y)^2
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1.(x+2y)^2-4(x-3y)^2
2.(2x-3y)^2-(2x+7y)^2
3.(x+y)^2-8(x+y-2)
4.x(a-b)^3-^y(b-a)^3
5.(3a+2b)^2-(a-b)^2
2.(2x-3y)^2-(2x+7y)^2
3.(x+y)^2-8(x+y-2)
4.x(a-b)^3-^y(b-a)^3
5.(3a+2b)^2-(a-b)^2
1.(x+2y)^2-4(x-3y)^2
=(x+2y)^2-(2x-6y)^2
=(x+2y+2x-6y)(x+2y-2x+6y)
=(3x-4y)(8y-x)
2.(2x-3y)^2-(2x+7y)^2
=(2x-3y+2x+7y)(2x-3y-2x-7y)
=-10y(4x+4y)
=-40y(x+y)
3.(x+y)^2-8(x+y-2)
=(x+y)²-8(x+y)+16
=(x+y-4)²
4.x(a-b)^3-y(b-a)^3
=x(a-b)^3+y(a-b)^3
=(x+y)(a-b)^3
5.(3a+2b)^2-(a-b)^2
=(3a+2b+a-b)(3a+2b-a+b)
=(4a+b)(2a+3b)
=(x+2y)^2-(2x-6y)^2
=(x+2y+2x-6y)(x+2y-2x+6y)
=(3x-4y)(8y-x)
2.(2x-3y)^2-(2x+7y)^2
=(2x-3y+2x+7y)(2x-3y-2x-7y)
=-10y(4x+4y)
=-40y(x+y)
3.(x+y)^2-8(x+y-2)
=(x+y)²-8(x+y)+16
=(x+y-4)²
4.x(a-b)^3-y(b-a)^3
=x(a-b)^3+y(a-b)^3
=(x+y)(a-b)^3
5.(3a+2b)^2-(a-b)^2
=(3a+2b+a-b)(3a+2b-a+b)
=(4a+b)(2a+3b)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(x+3y-4)(2x-y)
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2
(2x-y)(2x+y)-2(3x-4y)(4y+3x)
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
计算(2x-3y)(x+4y)-(3x+y)(x-2y)
(x-3y)(y+2x)-(4y-3x)(3x+4y)计算
把(x+3y)(3x-4y)-(x-2y)(x+3y)分解因式!
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20