thứ tự từ bé đến lớn : 6/15 4/5 9/10 24/20
ta có:\(\frac{24}{20}\);\(\frac{4}{5}\)=\(\frac{16}{20}\);\(\frac{6}{15}\)=\(\frac{2}{5}\)=\(\frac{8}{20}\);\(\frac{9}{10}\)=\(\frac{18}{20}\).Mà \(\frac{8}{20}\)<\(\frac{16}{20}\)<\(\frac{18}{20}\)<\(\frac{24}{20}\).Vậy \(\frac{6}{15}\)<\(\frac{4}{5}\)<\(\frac{9}{10}\)<\(\frac{24}{20}\)