Question

3 mũ x +3 mũ x+1 +3 mũ x+2=217

Answer 1

=>3^x(1+3+3^2)=217

=>3^x=217/13

=>\(x\in\varnothing\)

Answer 2

ko biết

 

Answer 3

`3^x+3^(x+1)+3^(x+2)=217`

`=>3^x . 1 + 3^x . 3^1 + 3^x . 3^2 = 217`

`=>3^x ( 1+3+9)=217`

`=>3^x . 13 = 217`

`=> 3^x=217:13`

`=>3^x=217/13`

`=>` Đề sai