用简便方法计算:6/13*39+7/13*40

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用简便方法计算:6/13*39+7/13*40用简便方法计算:6/13*39+7/13*40用简便方法计算:6/13*39+7/13*406/13*39+7/13*40=6/13*39+7/13*(3

用简便方法计算:6/13*39+7/13*40
用简便方法计算:6/13*39+7/13*40

用简便方法计算:6/13*39+7/13*40
6/13*39+7/13*40
=6/13*39+7/13*(39+1)
=6/13*39+7/13*39+7/13
=(6/13+7/13)*39+7/13
=1*39+7/13
=39又7/13