(2/71-1/69)×23+25÷71 用简便方法计算
问题描述:
(2/71-1/69)×23+25÷71 用简便方法计算
答
=2/71×23-1/69×23+25/71
=(46/71+25/71)-1/69×23
=1-1/3
=2/3