(x-y)X(2x-2y)²X(3x-3y)²
(x-y)X(2x-2y)²X(3x-3y)²
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
【x-3y][x+y]-[x-2y][x +2y]-[x-y
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
(3x-y)²-2x(4x-5y)-(x+2y)²
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
合并同类项:-6x²y-x+5x²y-2x+x³y+3x
(2x-y)²-4(x-y)(x+2y)
因式分解3x^2(x-y)+6x(y-x)