Question

[Hạ Miên]

CMR : 3 mũ x+3 +3 mũ x + 1 + 2 mũ x+2 + 2 mũ x+3 chia hết cho 6

Answer 1

[BLACK CAT]

Ta có:

3^x+3+3^x+1+2^x+2+2^x+3

=3^x(3³+3)+2^x(2²+2³)

=3^x.30+2^x.12

=3^x.6.5+2^x.2.6

=6.(3^x.5+2^x.2)\(⋮\)6

Vậy.......