Question

Tìm \(\frac{x}{y}\)biết:

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

Answer 1

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

\(\Rightarrow4.\left(3x-y\right)=3.\left(x+y\right)\)

\(\Rightarrow7x-4y=3x+3y\)

\(\Rightarrow7x-3x=4y+3y\)

\(\Rightarrow4x=7y\)

\(\Rightarrow\frac{x}{y}=\frac{7}{4}\)

Answer 2

Nhầm làm lại

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

\(\Rightarrow4\left(3x-y\right)=3\left(x+y\right)\)

\(\Rightarrow12x-4y=3x+3y\)

\(\Rightarrow12x-3x=4y+3y\)

\(\Rightarrow9x=7y\)

\(\Rightarrow\frac{x}{y}=\frac{7}{9}\)