\(\frac{x}{2}=\frac{y}{5}\)và \(3x-y=5\)
Áp dụng t/c dãy tỉ số bằng nhau ta có
\(\frac{x}{2}=\frac{y}{5}=\frac{3x-y}{3.2-5}=\frac{5}{1}=5\)
\(\Rightarrow\hept{\begin{cases}\frac{x}{2}=5\\\frac{y}{5}=5\end{cases}\Rightarrow\hept{\begin{cases}x=10\\y=25\end{cases}}}\)
Tim cac so nguyen x,y biet
a)\(\frac{x}{y}=\frac{2}{5}\)
b)\(\frac{x}{3}=\frac{y}{5}\)
Tim cac so nguyen x,y biet
a) \(\frac{x}{4}=\frac{y}{7}\)va \(x-y=9\)
b) \(\frac{x}{2}=\frac{y}{5}\)va 3x - y =5
Tim cac so nguyen x,y biet
\(\frac{x+3}{y-1}\) =\(\frac{3}{4}\)va x + y = 5
Tim cac so nguyen x,y biet
a)\(\frac{x-3}{y-2}\)=\(\frac{3}{2}\)va x - y = 4
b)\(\frac{x+3}{y-1}\)=\(\frac{3}{4}\)va x + y = 5
Tim cac so nguyen x,y biet
a)\(\frac{2x+1}{3}\) \(=\frac{4}{y}\)
b)\(\frac{x}{y}\) =\(\frac{2}{5}\)
Tim cac so nguyen x,y biet
\(\frac{x}{4}=\frac{y}{7}va-y=9\)
Tim cac so nguyen x,y biet
\(\frac{x-3}{y-2}=\frac{3}{2}\) va x - y = 4
Tim cac so nguyen x,y biet
\(\frac{x}{6}=\frac{y}{11}\)va 3x - 2y =-20
