\(\frac{15}{a}\cdot\frac{2}{3}\cdot\frac{3}{2}=\frac{5}{4}\)
\(\frac{15}{a}\cdot\frac{2}{3}=\frac{5}{4}:\frac{3}{2}\)
\(\frac{15}{a}\cdot\frac{2}{3}=\frac{5}{4}\cdot\frac{2}{3}\)
\(\frac{15}{a}\cdot\frac{2}{3}=\frac{10}{12}\)
\(\frac{15}{a}\cdot\frac{2}{3}=\frac{5}{6}\)
\(\frac{15}{a}=\frac{5}{6}:\frac{2}{3}\)
\(\frac{15}{a}=\frac{5}{6}\cdot\frac{3}{2}\)
\(\frac{15}{a}=\frac{15}{12}\)
Ta có: \(\frac{15}{a}=\frac{15}{12}\)
Mặt khác: 15 = 15 => a = 12
Vậy a tìm được bằng 12