(x+2y)(2x+y)-(x+2y)(2y-x)其中x=1/3,y=1/2
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
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3
先化简,再求值:[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2
1、x(x-y)(x+y)-x(x+y)^2
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
[(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y)(x-y)+(x-y)^2-(6x^2y-2xy^2)/2y,其中x=-2,y=1/3