(51又7/12+34.5/6/7)*5/14

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(51又7/12+34.5/6/7)*5/14
=(51又7/12+34.5*7/6)*5/14
=(51又7/12+30又1/4)*5/14
=81又5/6*5/14
=491/6*5/14
=2455/84
=29又19/84

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