8又1/5-3又3/10+1又4/15

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8又1/5-3又3/10+1又4/15
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8又1/5-3又3/10+1又4/15
8又1/5-3又3/10+1又4/15

8又1/5-3又3/10+1又4/15
8又1/5-3又3/10+1又4/15
=8又1/5+1又4/15-3又3/10
=10-3又3/10
=6又7/10