题目先化简,再求值:x2+2x+1x2+2x÷(1−1x+2)\dfrac{x^{2}+2x+1}{x^{2}+2x}\div \left(1-\dfrac{1}{x+2}\right)x2+2xx2+2x+1÷(1−x+21),其中x=3x=\sqrt{3}x=3.知识点：分式的化简求值章节：数与式 / 分式
