ldcf.net
当前位置:首页 >> 1÷(1/20+1/30). >>

1÷(1/20+1/30).

1÷(1/20+1/30) =1÷5/60 =12

1÷(1/20+1/30)=1÷1/12=12

首先计算 (1/30+1/20)=(2/60+3/60)=5/60=1/12 然后计算2÷(1/12)=2×12=24

1÷(1/20+1/30)=1÷(3/60+2/60)=1÷5/60=1÷1/12=1x12=12

得 1除(60分之5) 得 5分之60 得12

1÷(20分之1+30分之1) =1÷12分之1 =12

正确: 1÷(1/20+1/30) =1÷1/12 =12

1÷(1/20+1/30) =1÷(3/60+2/60) =1÷1/12 =12(天)

解: 1/2 + 1/6 +1/12+...+1/(2016×2017) =1/(1×2)+ 1/(2×3)+ 1/(3×4)+...+1/(2016×2017) =1- 1/2 +1/2 -1/3 +1/3 -1/4+...+1/2016 -1/2017 =1- 1/2017 =2016/2017

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com