So sánh: \(\frac{3}{8}\times\frac{5}{9}\) <||>||= \(\frac{3}{2}\times\frac{5}{6}.\)
Hướng dẫn giải:\(\frac{3}{8}\times\frac{5}{9}=\frac{3\times5}{8\times9}=\frac{15}{72}.\)
\(\frac{3}{2}\times\frac{5}{6}=\frac{3\times5}{2\times6}=\frac{15}{12}.\)
Ta có \(\frac{15}{72}<\frac{15}{12}\) (vi 72 > 12) nên \(\frac{3}{8}\times\frac{5}{9}<\)\(\frac{3}{2}\times\frac{5}{6}.\)
