问题标题:
化简:{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)]
问题描述:

化简:{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)]

贾贵玺回答:
  {[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)]   =(2a²-4ab)/[(a+b)(a-b)]×(a+b)/(a-2b)   =(2a²-4ab)/(a-b)/(a-2b)   =2a/(a-b)
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