Question

Answer 1

^{Bài này mik ko chắc cho lắm, sai cho xin lỗi ạ >:}

`C = ( 1/462 - 1/2) . ( 1.462 - 1/6) - (1/462 - 1/12) ...... ( 1.462 - 1/3540)`

`C = 1/462 . ( 1/2 +1/6 + 1/12 + .... + 1/3540)`

`C = 1/462 . ( 1/(1.2) + 1/(2.3) + 1/(3.4) + .... + 1/(59.60) )`

`C = 1/462 . ( 1 - 1/2 + 1/2 - 1/3 + ... + 1/59 - 1/60)`

`C = 1/462 . ( 1 - 1/60)`

`C = 1/462 . 59/60`

`C = 59/27720`

 

`#BaoL i nh`