化简:7y(x-3y)²-(3y-x)²
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
因式分解:(x-y)(3x-7y)²-4(x-y)(x+y)²
化简:7y(x-3y)²-(3y-x)²
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
化简:(2x-y)²-4(x-y)(x+y)
(x-y)X(2x-2y)²X(3x-3y)²
(3x+y)(3x-7y)
1、化简:5(x-y)²+(2x+y)-2(x-y)²-3(2x+y)-3(x-y)²
化简下列各式,并求值:3(x-y)²-7(x-y)+8(x-y)²+6(x-y) 其中x=2,y
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(