Question

aratati ca urmatoarele nr sunt compuse pentru orice valoare a nr natural n:a)A=6^n+3^n+2^n+1;b) B=15^n+5^n+1+3^n+5

Answer 1

a=n+3
6=n+3
n=6+3
n=9

a=n+2
6=n+2
n=6+2
n=8

a=n+1
6=n+1
n=6+1
n=7