Question

\(3^x+3^{x+1}+3^{x+2}=117\)

Answer 1

3^x + 3^x+1 + 3^x+2=117

3^x.(1+3+3^2)=117

3^x.13=117

3^x=117:13

3^x=9

Ta có:9=3^2

Vậy x=2

Answer 2

=>3^x+x+x+1+2=117

=>3^3x+3=117

=>