用简便方法计算.5/42/(5/8+5/6)

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用简便方法计算.5/42/(5/8+5/6)
用简便方法计算.5/42/(5/8+5/6)

用简便方法计算.5/42/(5/8+5/6)
5/42/(5/8+5/6)
=1/42/(1/8+1/6)
=1/21/(1/4+1/3)
=1/21/(7/12)
=1/21*12/7
=4/49