化简【(x²+y²)-(x-y)²+2y(x-y)】÷4y
化简:(2x-y)²-4(x-y)(x+y)
(2x-y)²-4(x-y)(x+2y)
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
化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x
(x+y)²+4(x+y)-5
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
先化简,再求值,[x²+y²-(x-y)²+2y(x-y)]÷4y.其中x,y满足x
化简:[(x+y)²-(x-y)²]÷2xy
[(x+y)(x-y)-(x-y)²]÷(-2y)数学高手来