5/13*[1又2/5+(6.5-2又1/3)/1又2/3]=? 30
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5/13×[1又2/5+(6.5-2又1/3)/1又2/3]
=5/13×[7/5+(13/2-7/3)×3/5]
=5/13×[7/5+(39/6-14/6)×3/5]
=5/13×(7/5+25/6×3/5)
=5/13×(7/5+5/2)
=5/13×(14/10+25/10)
=5/13×39/10
=3/2
=5/13×[7/5+(13/2-7/3)×3/5]
=5/13×[7/5+(39/6-14/6)×3/5]
=5/13×(7/5+25/6×3/5)
=5/13×(7/5+5/2)
=5/13×(14/10+25/10)
=5/13×39/10
=3/2
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