7/8+7/8-1/5 计算,

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7/8+7/8-1/5计算,7/8+7/8-1/5计算,7/8+7/8-1/5计算,7/8+7/8-1/5=14/8-1/5=7/4-1/5=35/20-4/20=31/207/8+7/8-1/5=(

7/8+7/8-1/5 计算,
7/8+7/8-1/5 计算,

7/8+7/8-1/5 计算,
7/8+7/8-1/5
=14/8-1/5
=7/4-1/5
=35/20-4/20
=31/20

7/8+7/8-1/5
=(7+7)/8-1/5
=14/8-1/5
=(14*5)/(8*5)-(1*8)/(5*8)
=(70-8)/40
=62/40
=31/20