4y²-(x²+y)+(x²-4y²) 帮我解出来
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
(x+y)²+4(x+y)-5
(2x+y)²-y(y+4x)-8x等于?
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
计算:(x+y)²-4(x+y)(x-y)+4(x-y)²
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
计算 [12(x+y)³(y-x)]³÷[4(x+y)²(x-y)]²
(x-2y)²+(2x-4y)(x+y)+(x+y)²
因式分解:(x-y)(3x-7y)²-4(x-y)(x+y)²
x(x-y)-y(y-x)+(x-y)²因式分解