x+1分之3-x+1分之3x 计算

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x+1分之3-x+1分之3x计算x+1分之3-x+1分之3x计算x+1分之3-x+1分之3x计算3/(x+1)-3x/(x+1)?=(3-3x)/(x+1)=3(1-x)/(1+x)(x+1)分之3-

x+1分之3-x+1分之3x 计算
x+1分之3-x+1分之3x 计算

x+1分之3-x+1分之3x 计算
3/(x+1)-3x/(x+1)?
=(3-3x)/(x+1)=3(1-x)/(1+x)

(x+1)分之3-(x+1)分之3x
=(x+1)分之(3-3x)

∵(2x^3-3x^2y-xy^2)+(-x^3+2x^2y+y^3)-(x^3-x^2y-xy^2) =2x -3x y-xy -x +2x y+y -x +x y+xy =y ∵(2x^3-3x^2y