x^2+x+1/x^2+1÷[1-x^3/1+x^2÷(x^2+x-2)]初二数学分式谢谢?

接你的
=(x平方+x+1)/(x平方+1) ÷[-(x-1)(x平方+x+1)/(x平方+1)×1/(x+2)(x-1)]
=(x平方+x+1)/(x平方+1) ÷[-(x平方+x+1)/(x平方+1)(x+2)]
=(x平方+x+1)/(x平方+1) ×[-(x平方+1)(x+2)/(x平方+x+1)]
=-(x+2)
=-x-2