![Count Down From 100 to 1 | Reverse counting 100 to 1 | Backward Counting 100 to 1 | 100 99 98 Song - YouTube Count Down From 100 to 1 | Reverse counting 100 to 1 | Backward Counting 100 to 1 | 100 99 98 Song - YouTube](https://i.ytimg.com/vi/BG2jNc_Hlf0/sddefault.jpg)
Count Down From 100 to 1 | Reverse counting 100 to 1 | Backward Counting 100 to 1 | 100 99 98 Song - YouTube
![3 Tính tổng các chuỗi số sau: (a) 100 - 99 +98-97+96-95 +.. +4 - 3 +2-1 100-17-2-9514 (b) 200 - 199 + 198 - 197+ ... + 4-3 +2 -1 4. Tính tổng các chuỗi số 3 Tính tổng các chuỗi số sau: (a) 100 - 99 +98-97+96-95 +.. +4 - 3 +2-1 100-17-2-9514 (b) 200 - 199 + 198 - 197+ ... + 4-3 +2 -1 4. Tính tổng các chuỗi số](https://img.hoidap247.com/picture/question/20200715/large_1594774917000.jpg)
3 Tính tổng các chuỗi số sau: (a) 100 - 99 +98-97+96-95 +.. +4 - 3 +2-1 100-17-2-9514 (b) 200 - 199 + 198 - 197+ ... + 4-3 +2 -1 4. Tính tổng các chuỗi số
![View question - what is 99+98+97+96 well not just that like adding all numbers less then 100 up that woult take to long to type View question - what is 99+98+97+96 well not just that like adding all numbers less then 100 up that woult take to long to type](https://web2.0calc.com/img/question-preview-image/what-is-99-98-97-96-well-not-just-that-like-adding.png)