Question

Tìm x

A) 2.x-2³.3²=138

B) (6.x-3⁴).7³=3.7⁴

Answer 1

Ta có : (6x - 3⁴) . 7³ = 3.7⁴

=> (6x - 3⁴) = 3.7

=> (6x - 3⁴) = 21

=> 6x - 81 = 21

=> 6x = 102 

=> x = 17

Answer 2

<div style="position:relative;height:0;padding-bottom:56.25%"><iframe src="https://www.youtube.com/embed/koxpMVzDZhk?ecver=2" width="640" height="360" frameborder="0" style="position:absolute;width:100%;height:100%;left:0" allowfullscreen></iframe></div>

Answer 3

Ta thực hiện nhân trước 2.x-2³.3²=138  2.x-8.9=138  2.x-72=138  x=138+72  x=210  x=210:2  x=105