Question

x phần 2 cộng 3 phần 4 = 6 phần 7

Answer 1

\(\dfrac{x}{2}+\dfrac{3}{4}=\dfrac{6}{7}\\ \dfrac{x}{2}=\dfrac{6}{7}-\dfrac{3}{4}\\ \dfrac{x}{2}=\dfrac{3}{28}\\ \Leftrightarrow28x=6\\ \Leftrightarrow x=\dfrac{3}{14}\)

Answer 2

x/2 + 3/4 = 6/7

x/2          = 6/7 - 3/4

x/2          = 24/28 - 21/28

x/2          = 3/28

=> 28x = 6

         x = 6 : 28

         x = 3/14

Answer 3