这堆糖果中原有奶糖x块水果糖5x/7(x-12)=5x/7*80%x-12=4x/73x/7=12x=28
这堆糖果中原有奶糖x块水果糖5x/7(x-12)=5x/7*80%x-12=4x/73x/7=12x=2
28