Làm cho mình bài 108 nha

Đáp án:

$\text{ a)  2x - 138 = 2³ . 3² }$

$\text{⇔ 2x - 138 = 8 . 9 }$

$\text{⇔ 2x - 138 = 72 }$

$\text{⇔ 2x= 72 + 138 }$

$\text{ ⇔ 2x = 210 }$

$\text{⇔ x = 210 : 2 }$

$\text{⇔ x= 105 }$

$\text{Vậy x= 105 }$

$\text{b) 231 - (x-6) = 1339 : 13 }$

$\text{⇔ 231 - (x - 6) = 103}$

$\text{⇔ x- 6 = 231 - 103 }$

$\text{⇔ x - 6 = 128 }$

$\text{⇔ x = 110 + 6 }$

$\text{⇔ x = 134}$

$\text{Vậy x = 134 }$