Question

Tìm x \(\dfrac{5x}{4}=\dfrac{80}{120}\)

Answer 1

\(\dfrac{5x}{4}=\dfrac{80}{120}\\ =>\dfrac{5x}{4}=\dfrac{2}{3}\\ =>5x.3=2.4\\ 5x.3=8\\ 5x=\dfrac{8}{3}\\ x=\dfrac{8}{3}:5\\ x=\dfrac{8}{15}\)

Answer 2

\(\dfrac{5x}{4}=\dfrac{80}{120}\)

\(\Rightarrow5x=\dfrac{4.120}{80}\)

\(\Rightarrow5x=6\)

\(\Rightarrow x=\dfrac{6}{5}\)