{5/6-(2/5+1/3)}x5/7分数啊.急

{5/6-(2/5+1/3)}x5/7分数啊.急
{5/6-(2/5+1/3)}x5/7
分数啊.急

{5/6-(2/5+1/3)}x5/7分数啊.急
全体通分吧,6、5、3的公倍数是30
[25/30-(12/30+10/30)]×5/7
=(25-12-10)/30×5/7
=3/30×5/7
=1/14