Question

Tìm x trong tỉ lệ thức sau

-4/3 : x/2 = 5/3 : 15/9

Answer 1

\(-\dfrac{4}{3}:\dfrac{x}{2}=\dfrac{5}{3}:\dfrac{15}{9}\\ \Leftrightarrow\dfrac{\left(-4\right)\cdot2}{3x}=\dfrac{5\cdot9}{3\cdot15}\\ \Leftrightarrow\dfrac{-8}{3x}=1\\ \Leftrightarrow3x=-8\\ \Leftrightarrow x=-8:3\\ \Leftrightarrow x=-\dfrac{8}{3}\\ Vậyx=-\dfrac{8}{3}\)

Answer 2

\(\dfrac{-4}{3}:\dfrac{x}{2}=\dfrac{5}{3}\dfrac{15}{9}\)

\(\Leftrightarrow\dfrac{-4}{3}.\dfrac{2}{x}=\dfrac{5}{3}.\dfrac{9}{15}\)

\(\Leftrightarrow\dfrac{-8}{3x}=\)1

\(\Leftrightarrow\)\(3x=-8\)

\(\Leftrightarrow\)\(x=-8:3\)

\(\Leftrightarrow x=\dfrac{-8}{3}\)