Question

Tìm x

-5/12x=-25/36.           b)(-5/6-x).9/7=16/7.          c)(3/4-x).5/3=7/6

Answer 1

\(a.\dfrac{-5}{12}x=\dfrac{-25}{36}\\ x=\dfrac{-25}{36}:\dfrac{-5}{12}=\dfrac{-25}{36}\cdot\dfrac{-12}{5}\\ x=\dfrac{5}{3}\\ b.\left(\dfrac{-5}{6}-x\right)\cdot\dfrac{9}{7}=\dfrac{16}{7}\\ \dfrac{-5}{6}-x=\dfrac{16}{9}\\ x=\dfrac{-5}{6}-\dfrac{16}{9}\\ x=-\dfrac{47}{18}\\ c.\left(\dfrac{3}{4}-x\right)\cdot\dfrac{5}{3}=\dfrac{7}{6}\\ \dfrac{3}{4}-x=\dfrac{7}{10}\\ x=\dfrac{3}{4}-\dfrac{7}{10}=\dfrac{1}{20}\)