(3/8+1/27)*7+17/29+1/27如何巧算
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(3/8+1/27)*7+17/29+1/27如何巧算
=3/8*7+1/27*7+17/29+1/27
=21/8+17/29+(7/27+1/27)
=21/8+17/29+8/27
=21971/6264
=3又3179/6264
=21/8+17/29+(7/27+1/27)
=21/8+17/29+8/27
=21971/6264
=3又3179/6264