Question

Câu 29. Nếu  1/3 : (1/6 - 1/2) <_ x <_ 2/3 x (-1/6 + 3/4) thì giá trị của x bằng :

A.0

B.1

C.2

D.3

Answer 1

\(\dfrac{1}{3}:\left(\dfrac{1}{6}-\dfrac{1}{2}\right)< =x< =\dfrac{2}{3}\left(-\dfrac{1}{6}+\dfrac{3}{4}\right)\)

=>\(\dfrac{1}{3}:\left(\dfrac{1}{6}-\dfrac{3}{6}\right)< =x< =\dfrac{2}{3}\left(-\dfrac{2}{12}+\dfrac{9}{12}\right)\)

=>\(\dfrac{1}{3}:\dfrac{-2}{6}< =x< =\dfrac{2}{3}\cdot\dfrac{7}{12}\)

=>\(\dfrac{1}{3}\cdot\dfrac{-6}{2}< =x< =\dfrac{14}{24}=\dfrac{7}{12}\)

=>\(-1< =x< =\dfrac{7}{12}\)

=>Chọn A