1 /2+1/6+1/12+1/20+1/30+1/42 用简便方法计算这道题
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 20:42:24
![1 /2+1/6+1/12+1/20+1/30+1/42 用简便方法计算这道题](/uploads/image/z/1063914-42-4.jpg?t=1+%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42+%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%E8%BF%99%E9%81%93%E9%A2%98)
1 /2+1/6+1/12+1/20+1/30+1/42 用简便方法计算这道题
1 /2+1/6+1/12+1/20+1/30+1/42 用简便方法计算这道题
1 /2+1/6+1/12+1/20+1/30+1/42 用简便方法计算这道题
1 /2+1/6+1/12+1/20+1/30+1/42
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7