\(\frac{3+x}{y+5}=\frac{3}{5}\)
\(\Rightarrow x\in B\left(3\right)=\left\{0;3;6;9;....\right\}\)
\(\Rightarrow y\in B\left(5\right)=\left\{0;5;10;15;...\right\}\)
HOK TỐT .
3 + x/5 + y = 3/5
<=> 5( 3 + x ) = 3( 5 + y )
<=> 15 + 5x = 15 + 3y
<=> 5x = 3y
=> x = 3
y = 5
Vậy x = 3 ; y = 5