母虎归来全文:如何用简便方法计算3/4+3/28+3/70+3/130+3/208
来源:百度文库 编辑:高考问答 时间:2024/05/15 18:17:24
如何用简便方法计算3/4+3/28+3/70+3/130+3/208
3/4+3/28+3/70+3/130+3/208
=(1-1/4)+(1/4-1/7)+(1/7-1/10)+(1/10-1/13)+(1/13-1/16)
=1-1/16
=15/16
3/4+3/28+3/70+3/130+3/208
=(1-1/4)+(1/4-1/7)+(1/7-1/10)+(1/10-1/13)+(1/13-1/16)
=1-1/16
=15/16