1/4-1+1/3.(5/2x-6) – (3/8x + 1)=4,5 TÌM X GẤP

Đáp án:

 $ \dfrac{1}{4} -1 +\dfrac{1}{3} . (\dfrac{5}{2}x – 6) – (\dfrac{3}{8}x + 1) = 4,5$

$⇔\dfrac{1}{4} -1 + \dfrac{5}{6}x -2 -\dfrac{3}{8}x – 1 = 4,5$

$⇔\dfrac{5}{6}x -\dfrac{3}{8}x = 4,5 +1 +1 +2 -\dfrac{1}{4}$

$⇔\dfrac{11}{24}x =\dfrac{33}{4}$

$⇔x = \dfrac{33}{4} : \dfrac{11}{24}$

$⇔ x = 18$

Vậy $x=18$