Question

Góc chia sẻ:

Cho tỉ lệ thức : \(\frac{3x+5y}{x-2y}\)=\(\frac{1}{4}\)Tìm \(\frac{x}{y}\)( Ôn tập kt 45" giữa kì 1 lớp 7 )

Answer 1

\(\frac{3x+5y}{x-2y}=\frac{1}{4}\)

\(\Rightarrow\left(3x+5y\right).4=x-2y\)

\(\Leftrightarrow12x+20y=x-2y\)

\(\Leftrightarrow11x=-22y\)

\(\Leftrightarrow x=-2y\)

\(\Rightarrow\frac{x}{y}=-\frac{2}{1}\)

Answer 2

\(\frac{3x+5y}{x-2y}=\frac{1}{4}\)

\(\Rightarrow\left(3x+5y\right)4=x-2y\)

\(\Rightarrow12x+20y=x-2y\)

\(\Rightarrow12x-x=-2y-20y\)

\(\Rightarrow11x=-22y\)

\(\Rightarrow\frac{x}{y}=\frac{-22}{11}\)

\(\Rightarrow\frac{x}{y}=-2\)