là ng tinh khhon pn

\(\frac{a+4}{b}=1\Rightarrow a+4=b\)

\(\frac{a}{b+3}=\frac{1}{2}\Rightarrow2a=b+3\)

=>2a=a+4+3

=>2a-a=7

=>a=7

=>b=11

vậy \(\frac{a}{b}=\frac{7}{11}\)