二又5/6一(2/3+7/12) 15又1/4一五又1/2+七又5/6
2个回答
2017-06-04
展开全部
2又5/6-(2/3+7/12)
=2又5/6-15/12
=2又10/12-15/12
=1又7/12,
15又1/4-5又1/2+7又5/6
=(15-5+7)+(1/4+5/6-1/2)
=17+7/12
=17又7/12
=2又5/6-15/12
=2又10/12-15/12
=1又7/12,
15又1/4-5又1/2+7又5/6
=(15-5+7)+(1/4+5/6-1/2)
=17+7/12
=17又7/12
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