Question

tìm x biết ( 1/2+x)×3/4=2/3

Answer 1

( 1/2 + x ) x 3/4 = 2/3
  1/2 + x            = 2/3 : 3/4
  1/2 + x            = 8/9
           x            = 8/9 - 1/2
           x            = 7/18

Answer 2

\(\left(\dfrac{1}{2}+x\right)\times\dfrac{3}{4}=\dfrac{2}{3}\)

\(\Leftrightarrow\dfrac{1}{2}+x=\dfrac{2}{3}:\dfrac{3}{4}\)

\(\Leftrightarrow\dfrac{1}{2}+x=\dfrac{8}{9}\)

\(\Leftrightarrow x=\dfrac{8}{9}-\dfrac{1}{2}\)

\(\Leftrightarrow x=\dfrac{7}{18}\)