3(2x²-y²)-2(3y²-2x²)化简
(3x-y)²-2x(4x-5y)-(x+2y)²
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
3(x-2y)²+(x-2y)因式分解
3m(x-y)-2(y-x)²因式分解
[(3x-2y)²-(3x+2y)(3x-2y)]/(2y-3y)
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
(3x-2y)²+(3x-2y)(-2y-3x)
(2x-3y)²-(3x-2y)(x+y)
(x-2y)²+(2x-4y)(x+y)+(x+y)²