5/6-(1/2+1/3)=5/6-5/6=0
5/6-(1/2+1/3)简便方法？=5/6-3/6-2/6=0
=5/6-（3/6+2/6）=5/6-5/6=0
=5/6-(3/6+2/6)=0,望采纳，谢谢
