化简:3x^3 y^4 -4x^4 y^3 / 3x^4 y^3 -4x^3 y^4

（y-x)+x(x-y)^3-(y-x)^4 因式分解 计算 3x+4y/x-y+3y/y-x-4x/x-y 3x+4y/x-y +3y/y-x -4x/x-y x(4y-x)(x-3y)+y(3y-x)(x-4y)因式分解 （x+y）^6/(x+y)^4-(x-y)^5/(x-y)^3 化简 .. -4(x-y)平方-(x-y)+3(y-x)+6(y-x)平方 化简 化简：2x-{-3y+[4x-(3x-y]} 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简 (x+3y-4)(2x-y) (x-y)^3-(x-y)^4 因式分解 (x-y)^3+4(y-x)因式分解 (x-y)²+4(x-y)+3 (x-y)3乘(y-x)4 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) (x-y)^4+x(x-y)^3-y(y-x)^3因式分解(x-y)^4+x(x-y)^3-y(y-x)^3 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y)