Question

\(A=3+6+9+...+99-2-5-8-...-98\)

giúp mk zới!!

Answer 1

A = 3 + 6 + 9 + ... + 99 - 2 - 5 - 8 - ... - 98

= (3 - 2) + (6 - 5) + (9 - 8) + ... + (99 - 98)

= 1 + 1 + 1 + ... + 1

= 33 

Answer 2

a