(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=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
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
1、x(x-y)(x+y)-x(x+y)^2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
(X-Y)²+(3X-2Y)(2X+Y)-X(6X-Y),其中X=½,Y=1(先化简再求值)
x+y)(x-y)+(x-y)^2-(6x^2y-2xy^2)/2y,其中x=-2,y=1/3
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3