1/4+1/28+1/70+..+1/8554的和是多少
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/27 16:50:28
![1/4+1/28+1/70+..+1/8554的和是多少](/uploads/image/z/2696824-64-4.jpg?t=1%2F4%2B1%2F28%2B1%2F70%2B..%2B1%2F8554%E7%9A%84%E5%92%8C%E6%98%AF%E5%A4%9A%E5%B0%91)
x)3767 zz@zXtɬ&$TΆTsm
4uLM6 P\SQ2 RkjXa4XmiӴU@ d1/.H̳ 6X
1/4+1/28+1/70+..+1/8554的和是多少
1/4+1/28+1/70+..+1/8554的和是多少
1/4+1/28+1/70+..+1/8554的和是多少
1/4=1/3*(1-1/4) 1/28=1/3*(1/4-1/7) …… 1/8554=1/3*(1/91-1/94) 1/4+1/28+1/70+..+1/8554 =1/3*[(1-1/4)+(1/4-1/7)+……+(1/91-1/94)] =1/3*(1-1/94) =31/94