用简便方法计算69×3/7 3/7 日期:2021-11-03 17:45:40 人气:1 用简便方法计算69×3/7 3/7 用简便方法计算69×3/7+ 3/7解:69×3/7+ 3/7=(69+1)×3/7=70×3/7=30