3又14/15-1又7/10-3/20=?2又2/7+(1又3/14-0.5)
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3又14/15-1又7/10-3/20=?2又2/7+(1又3/14-0.5)
3又14/15-1又7/10-3/20=?2又2/7+(1又3/14-0.5)
3又14/15-1又7/10-3/20=?2又2/7+(1又3/14-0.5)
3又14/15-1又7/10-3/20
=59/15-17/10-3/20
=236/60-102/60-9/60
=(236-102-9)/60
=125/60
=25/12
2又2/7+(1又3/14-0.5)
=16/7+17/14-1/2
=32/14-17/14-7/14
=(32-17-7)/14
=8/14
=4/7