x^3-x^2y -4y^3 这道题怎么因式分解

4x+2y-3x-y 简写怎么写? (X-Y)^2-4(X-Y)+3怎么做, （x-y)^3*(x-y)^2*(y-x)这道题怎么算（x-y)^3*(x-y)^2*(y-x)看不懂？（x-y)^3乘(x-y)^2乘(y-x)总可以了吧 (x+y)(x-y)+3y^2怎么做? x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) (2x-3y)2-(4y-3x)(3x+4y)怎么做? 怎么化简-2(x-3y) 3(2x-y)-4(2x 3y)? 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 (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) (y-x)(x-y)^3(y-x)^5怎么算 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) (2x^3y^3-2x^3y+1/8^4+y)/(-1/2x^3y)怎么算! (-2x+6y)的平方-(3x+2y)(2x-3y)+(-9y)*4怎么化简