Question

tìm x : \(\frac{x}{5}\)=\(\frac{y}{3}\)và x.y=60

(giúp nhanh mình nha ) 

Answer 1

Vì \(\frac{x}{5}=\frac{y}{3}=>3x=5y\)

\(=>x=\frac{5}{3}y\)

Vì \(x.y=60\)

\(\Leftrightarrow\)\(\frac{5}{3}y.y=60\)

\(\Rightarrow\)\(y^2=60:\frac{5}{3}=36=>y=6\)

\(=>x=60:6=10\)

Answer 2

dễ

\(\frac{x}{5}=\frac{y}{3}=\frac{x.y}{5.3}=\frac{60}{15}=4\)

\(\frac{x}{5}=4\Rightarrow x=20\)

\(\frac{y}{3}=4\Rightarrow y=12\)