Question

3^4 . ( 15 + 2 . x ) = 3^7

Answer 1

`3^4 *(15+2x)=3^7`

`=> 15+2x=3^7:3^4=3^(7-4)`

`=> 15+2x=3^3`

`=> 15+2x=27`

`=> 2x=27-15`

`=> 2x=12`

`=> x=6`

Vậy `x=6`

Answer 2

\(3^4\cdot\left(15+2^{}x\right)=3^7\)

\(15+2x=3^7:3^4=3^{7-4}=3^3=27\)

\(2x=27-15=12\)

\(x=12:2=6\)

Vậy \(x=6\)

Answer 3

= 81 . ( 15 +2.x) = 2187

15+2.x = 2187 : 81

15+ 2.x = 27

2.x = 27-15

2.x = 12

x = 12 : 2

x= 6

vậy x =6

Answer 4

3^4.(15+2x)=3^7

15+2x=3^7 : 3^4 = 3^7 - ^4 = 3^3 = 27

2x=27-15=12

×=12:2

Vậy x =6