Phân số a/b là :
\(\frac{3}{4}+\frac{1}{2}=\frac{3}{4}+\frac{2}{4}=\frac{3+2}{4}=\frac{5}{4}\)
Vậy \(\frac{a}{b}=\frac{5}{4}\)
Có \(\frac{a}{b}-\frac{1}{2}=\frac{3}{4}\)
\(\Rightarrow\frac{a}{b}=\frac{3}{4}+\frac{2}{4}\)
\(\Rightarrow\frac{a}{b}=\frac{5}{4}\)