
[5又1/6-(1.2+1又7/15)×1.5]÷2又1/3
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=[5又1/6-(6/5+22/15)×3/2]÷7/3
=[5又1/6-(18/15+22/15)×3/2]÷7/3
=(5又1/6-40/15×3/2)÷7/3
=(5又1/6-4)÷7/3
=1又1/6÷7/3
=7/6×3/7
=1/2
=[5又1/6-(18/15+22/15)×3/2]÷7/3
=(5又1/6-40/15×3/2)÷7/3
=(5又1/6-4)÷7/3
=1又1/6÷7/3
=7/6×3/7
=1/2
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