2x(x-4y)-3y(x+2y)=?(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-3Y)(X+3Y)-(X+2Y)(X-4Y)-(2X-Y)2的平方
化简,亲快啊啊急!(3x-2y)(7x-y)-(4x+3y)(x-y)
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
(3x-y)²-2x(4x-5y)-(x+2y)²
(x-y)(x-2y)-(3x-2y)(x-3y)
(x-2y)²+(2x-4y)(x+y)+(x+y)²
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
.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
2(x+y)-3分之2(x-y)-3(x+y)+3分之2(x-y)化简 其中x=-2,y=1