Question

[Trần Linh Trang]

 a) tìm x,y biết

\(\frac{x}{-3}=\frac{y}{5}\)và \(x\cdot y=-\frac{5}{27}\)

\(\frac{\frac{-1}{2}}{2x-1}=\frac{\frac{0.2}{-3}}{5}\)

b) Tìm x,y,z biết rằng \(\frac{1}{2}x=\frac{2}{3}y=\frac{3}{4}z\)và x - y = 15

Answer 1

[Alexander Sky Sơn Tùng MTP]

Có: \(\frac{\frac{-1}{2}}{2x-1}=\frac{\frac{0,2}{-3}}{5}\)\(\Rightarrow\left(2x-1\right).\frac{0,2}{-3}=\frac{-1}{2}.5\Leftrightarrow\left(2x-1\right).\frac{0,2}{-3}=\frac{-5}{2}\)\(\Leftrightarrow2x-1=\frac{-75}{2}\Leftrightarrow2x=\frac{-73}{2}\Leftrightarrow x=\frac{-73}{4}\)

Vậy x=-73/4