3x*(-4x^3y^2)^2-(2x^2y)^3*5xy,其中x=1,y=-2

x(x-y)2-(y-x)3 [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 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+3y-4)(2x-y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) x^3+2x^2y-4x-8y 2x-{-3y+[4x-(2y-x)]} 化简：2x-{-3y+[4x-(3x-y]} 4x*3-4x*2y-(x-y)因式分解 因式分解3x^2(x-y)+6x(y-x) 3^x+2x=y,x 1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简