题目(1)(1)(1)计算：2m−2−8m2−4\dfrac{2}{m-2}-\dfrac{8}{{{m}^{2}}-4}m−22−m2−48； (2)(2)(2)先化简，再求值： (1x+1+x2−2x+1x2−1)÷x−1x+1(\dfrac{1}{x+1}+\dfrac{{{x}^{2}}-2x+1}{{{x}^{2}}-1})\div \dfrac{x-1}{x+1}(x+11+x2−1x2−2x+1)÷x+1x−1，其中x=2x=2x=2．知识点：分式的化简求值,分式的混合运算章节：未标注
