y(x+y)+(x+y)(x-y)-x的2次方,其中X=-2,y=2分之一.3分之2a+（-3分之2ab）-4分之3b的2次方+（-4分之3a的2次方）-（-2分之1b的2次方）

{(x,y) |x|+|y| x>y?x:y x(x+y)(x-y)-x(x+y)的平方 因式分解：x(x+y)(x-y)-(x+y)的平方 x^/y-x-y^/y-x化简. 化简x(y-x)-y(x-y) 行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y | y/(x+y)-x/(x-y) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x/(x+y)(x-y)的三次方,y/(y+x)(y-x)的平方通分 (y-x)²(x-y)+(x-y)的三次方+2(x-y)²(y-x) x y x+yy x+y xx+y x y (3x-y)(3y+x)-(x-y)(x+y) 化简x/y(x+y)-y/x(x+y) 化简 x / y(x+y) - y / x(x+y) = 化简:(x+ y)(x-y) +(x+ y) +(x-y) x+y (x+y)