Tính tổng sau: 2+4+6+8+ ... +96+98+100

Question

$2 + 4 + 6 + 8 + ... + 96 + 98 + 100$

$= (2 + 98) + (4 + 96) + (6 + 94) + ... + (48 + 52) + (50 + 100)$

$= \underset{24 s o á}{\underset{⏟}{100 + 100 + 100 + ... + 100}} + 150$

$= 100 . 24 + 150$ $= 2550$

Answer 1

Trả lời:

Giải bởi Vietjack

$2 + 4 + 6 + 8 + ... + 96 + 98 + 100$

$= (2 + 98) + (4 + 96) + (6 + 94) + ... + (48 + 52) + (50 + 100)$

$= \underset{24 s o á}{\underset{⏟}{100 + 100 + 100 + ... + 100}} + 150$

$= 100 . 24 + 150$ $= 2550$