7² – 5.(x – 3) = 3⁴: 3²

2 câu trả lời

`7^2 - 5.(x - 3) = 3^4 : 3^2`

`=> 49 - 5.(x - 3) = 3^2`

`=> 49 - 5.(x - 3) = 9`

`=> 5.(x - 3) = 49 - 9`

`=> 5.(x - 3) = 40`

`=> x - 3 = 40 : 5`

`=> x - 3 = 8`

`=> x = 8 + 3`

`=> x = 11`

Vậy `x = 11`

`#dtkc`

Đáp án:

$7^2-5.(x-3)=3^4:3^2$

$⇔ 49-5.(x-3)=9$

$⇔ 5.(x-3)=49-9$

$⇔ 5.(x-3)=40$

$⇔ x-3= 40:5$

$⇔ x-3=8$

$⇔ x=11$

$vậy$ $x=11$