Question

Tìm x,y biết :\(\frac{3}{x}=\frac{y}{35}=\frac{-36}{84}\)

 

Answer 1

\(\frac{3}{x}=\frac{y}{35}=\frac{-36}{84}\)

xét : \(\frac{3}{x}=\frac{-36}{84}\)

\(\Rightarrow\) \(3\cdot84=-36\cdot x\)

\(\Rightarrow\) \(252=-36\cdot x\)

\(\Rightarrow\) \(252:\left(-36\right)=x\)

\(\Rightarrow\) \(-7=x\)

thay vào x ta có:

\(\frac{3}{-7}=\frac{y}{35}=\frac{-36}{84}\)

xét \(\frac{3}{-7}=\frac{y}{35}\)

\(\Rightarrow\) \(3\cdot35=-7\cdot y\)

\(\Rightarrow\) \(105=-7\cdot y\)

\(\Rightarrow\) \(105:\left(-7\right)=y\)

\(\Rightarrow\) \(-15=y\)

vậy x = 3 ; y = -15