((x-y)^2+(x+y)^2)×(x^4-x^2y^2+y^4)化简
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(X-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
(x-y/x+2y)³
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
化简,亲快啊啊急!(3x-2y)(7x-y)-(4x+3y)(x-y)
(3x-y)²-2x(4x-5y)-(x+2y)²
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
化简:(2x-y)²-4(x-y)(x+y)