137×78/7的简便运算 日期:2021-11-06 03:50:43 人气:1 137×78/7的简便运算 137×78/7 =?140-3?×78/7 =140×78/7-3×78/7 =1560-33又3/7 =1526又4/7 等于1526又7分之4