Question

-2+6-12+16-22+26-...-92+96

Answer 1

-2 + 6 - 12 + 16 - 22 + 26 - ... - 92 + 96

= ( -2 + 6 ) + ( -12 + 16 ) + (-22 + 26) ... + ( -92 + 96 ) (10 nhóm)

= 4 + 4 + 4 + ... + 4 (Có 10 số 4)

= 4.10 = 40