简便计算 99乘50分之21
问题描述:
简便计算 99乘50分之21
答
(100-1)*21/50
=100*21/50-1*21/50
后边自己算吧
答
99*(21/50)
=21*(99/50)
=(21*2)* (99/50*2)
=42*[(100-1)/100]
=42*(1-0.01)
=42-0.42
=41.58
答
(100-1)*(20+1)/50=(100*20+100-20-1)/50
然后100*20,100,-20.-1分别除以50啊....
比各位的都简便。
答
= (100-1)乘50分之21
然后把括号打开
=21×2-21/50
等于 42又50分之21
答
99 * (21/50)
= (100-1) * (21/50)
= (100 * 21)/50 - 21/50
= 42 - 21/50
= 42 - 0.42
= 41.58