Đáp án:
$\text{m) x = 40.}$
$\text{n) Đề sai.}$
$\text{p) x = 9.}$
$\text{q) x = 10.}$
Giải thích các bước giải:
$\text{m) x - 6 ÷ 2 - (48 - 24.2 ÷ 6 - 3) = 0.}$
$\text{⇒ x - 3 - (48 - 48 ÷ 6 - 3) = 0.}$
$\text{⇒ x - 3 - (48 - 8 - 3) = 0.}$
$\text{⇒ x - 3 - 37 = 0.}$
$\text{⇒ x - 40 = 0.}$
$\text{⇒ x = 40.}$
$\text{Vậy x = 40.}$
$\text{n) 460 + 85.4 = (x = 200) ÷ 4.}$
$\text{????? Sai đề rồi em tus ơi.}$
$\text{p) [61 + (53 - x)].17 = 1785.}$
$\text{⇒ 61 + (53 - x) = 1785 ÷ 17.}$
$\text{⇒ 61 + (53 - x) = 105.}$
$\text{⇒ 53 - x = 105 - 61.}$
$\text{⇒ 53 - x = 44.}$
$\text{⇒ x = 53 - 44.}$
$\text{⇒ x = 9.}$
$\text{Vậy x = 9.}$
$\text{q) 3636 ÷ (12x - 19) = 36.}$
$\text{⇒ 12x - 19 = 3636 ÷ 36.}$
$\text{⇒ 12x - 19 = 101.}$
$\text{⇒ 12x = 101 + 19.}$
$\text{⇒ 12x = 120.}$
$\text{⇒ x = 120 ÷ 12.}$
$\text{⇒ x = 10.}$
$\text{Vậy x = 10.}$
