题目先化简,再求值:xx+2−x2+2x+1x+2÷x2−1x−1\dfrac{x}{x+2}-\dfrac{x^{2}+2x+1}{x+2}\div \dfrac{x^{2}-1}{x-1}x+2x−x+2x2+2x+1÷x−1x2−1,其中x=3−2x=\sqrt{3}-2x=3−2.知识点：分式的化简求值章节：数与式 / 分式
