4x^2y^2÷(-2y^3/3x)

x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 4x-3y/x-2y÷6y-8x/y-2x (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , (x+3y-4)(2x-y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) [2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2 先化简再求值:[(x+3y)(x-3y)-(x+3y)^2]÷4y x(x-y)2-(y-x)3 (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 【(3x-2y)^2-(4x+y)(4y-x)】÷3x [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y