x²-4y²-3x+6y
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
因式分解:(x-y)(3x-7y)²-4(x-y)(x+y)²
(x-y)³+9(x-y)-6(x-y)²
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
(x+y)²+x+y-6因式分解
(x+y)²+4(x+y)-5
(3x-y)²-2x(4x-5y)-(x+2y)²
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
(x+y)和(x-y)各看成一个整体,合并同类项2(x+y)-3(x-y)²+3(x+y)+4(x-y)