121乘以3/4减去3/8乘以40减去0.75的简便算法_数学解答

121乘以3/4减去3/8乘以40减去0.75的简便算法

人气：344 ℃　时间：2020-04-11 08:02:08

解答

121*(3/4)-(3/8)*40-0.75
= 121*(3/4)-(3/4)*20-3/4
=(121-20-1)*(3/4)
=100*(3/4)
=75