解:
5/7+2/5x3÷1/2
=5/7+6/5x2
=5/7+12/5
=25/35+84/35
=109/35 (35分之109)
5/7十2/5X3÷1/2=5/7十6/5X2=25/35十84/35=1o9/35
解如下图所示