1.x^3+x^3y^3+y^3=12x+xy+y=0是方程组

(3x-y)(3y+x)-(x-y)(x+y) （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. 12y(x-y)^2-8(x-y)^3=? (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 3x+y=2 -y/x+y=123x+y=2 （-y/x）+y=12 x(x-y)2-(y-x)3 化简 x-y/(y-x)^3= (x+y)(2x-3y)=? （y-x)+x(x-y)^3-(y-x)^4 因式分解 [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 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 3^x+2x=y,x