简算3/19+4/19+5/19+6/19+...+19/19+20/19+21/19
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/20 04:03:51
![简算3/19+4/19+5/19+6/19+...+19/19+20/19+21/19](/uploads/image/z/70143-15-3.jpg?t=%E7%AE%80%E7%AE%973%2F19%2B4%2F19%2B5%2F19%2B6%2F19%2B...%2B19%2F19%2B20%2F19%2B21%2F19)
简算3/19+4/19+5/19+6/19+...+19/19+20/19+21/19
简算3/19+4/19+5/19+6/19+...+19/19+20/19+21/19
简算3/19+4/19+5/19+6/19+...+19/19+20/19+21/19
3/19+4/19+5/19+6/19+...+19/19+20/19+21/19
=(3/19+21/19)×19÷2
=24/19×19÷2
=24÷2
=12
3/19+4/19+5/19+6/19+...+19/19+20/19+21/19
=(3/19+21/19)×19÷2
=24/19×19÷2
=24÷2
=12