14/25-(4分之1+2/3)的合等于多少

14/25-(4分之1+2/3)的合等于多少

  14/25-(1/4+2/3)
  =14/25-(3+8)/12
  =14/25-11/12
  =(14*12-11*25)/(12*25)
  =-107/300
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