Toán 7

C

chaugiang81

$\dfrac{3x-y}{x+y}= \dfrac{1}{2}$
$<=> 6x -2y= x+y$
$<=> 5x= 3y$
$=> \dfrac{x}{y}= \dfrac{3}{5}$
 
M

maloimi456

Ta có: $\frac{3x-y}{x+y} = \frac{1}{2}$

\Rightarrow $2(3x-y) = x+y$

\Leftrightarrow $6x-2y = x+y$

\Leftrightarrow $6x-x=y+2y$

\Leftrightarrow $5x = 3y$

\Rightarrow $\frac{x}{y} = \frac{3}{5}$
 
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