Tính tổng sau:

1+2+3+...+99+100

Question

$1 + 2 + 3 + 4 + ... + 97 + 98 + 99 + 100$

$= (1 + 100) + (2 + 99) + (3 + 98) + ... + (49 + 52) + (50 + 51)$

$= \underset{50 s o á}{\underset{⏟}{101 + 101 + 101 + ... + 101 + 101}}$

$= 101. 50$ $= 5050$

Answer 1

Trả lời:

Giải bởi Vietjack

$1 + 2 + 3 + 4 + ... + 97 + 98 + 99 + 100$

$= (1 + 100) + (2 + 99) + (3 + 98) + ... + (49 + 52) + (50 + 51)$

$= \underset{50 s o á}{\underset{⏟}{101 + 101 + 101 + ... + 101 + 101}}$

$= 101. 50$ $= 5050$