a ) Vì \(15.4=20.3\)
\(\frac{15}{20}=\frac{3}{4}\); \(\frac{15}{3}=\frac{20}{4}\)
\(\frac{4}{20}=\frac{3}{15}\); \(\frac{4}{3}=\frac{20}{15}\)
b )
Vì \(2.9=3.6\)
\(\frac{2}{3}=\frac{6}{9}\); \(\frac{2}{6}=\frac{3}{9}\)
\(\frac{9}{3}=\frac{6}{2}\);\(\frac{9}{6}=\frac{3}{2}\)
Chúc bạn học tốt !!!