Question

Answer 1

\(\Leftrightarrow2x+3=2+5=7\)

=>2x=4

hay x=2

Answer 2

`=> 5^(2x+3) = 5^7`

`=> 2x + 3 = 7`

`=> 2x = 4`

`=> x = 2`

Answer 3

`5^(2x+3) = 25.5^5`

`=>5^(2x+3) = 5^2 . 5^5`

`5^(2x+3) = 5^(2+5) = 5^7`

`=> 2x + 3=7`

`=> 2x = 7-3=4`

`=> x = 4/2 = 2`

Vậy `x=2`