Question

Bài 7 Tìm x biết

b, \(\dfrac{x}{2}-\left(\dfrac{3x}{5}-\dfrac{13}{5}\right)=\dfrac{7}{5}+\dfrac{7.x}{10}\)

Answer 1

\(b.\dfrac{x}{2}-\left(\dfrac{3x}{5}-\dfrac{13}{5}\right)=\dfrac{7}{5}+\dfrac{7x}{10}\)

Ta có x chung nên ta có:

\(\dfrac{x}{2}-\left(\dfrac{3}{5}-\dfrac{13}{5}\right)=\dfrac{7}{5}+\dfrac{7}{10}\)

\(\dfrac{x}{2}-\left(-2\right)=\dfrac{21}{10}\)

\(\dfrac{x}{2}=\dfrac{21}{10}+\left(-2\right)\)

\(\dfrac{x}{2}=\dfrac{21}{10}+\dfrac{-20}{10}\)

\(\dfrac{x}{2}=\dfrac{1}{10}\)

\(\dfrac{5x}{10}=\dfrac{1}{10}\)

\(5x=1\)

\(x=\dfrac{1}{5}\)

x = 0.2

Vậy x=0.2