Rút gọn các phân số sau: 12/4; 24/72; 111/333; 1212/2424

Hướng dẫn: 

\(\frac{{12}}{4} = \frac{{12:4}}{{4:4}} = \frac{3}{1} = 3\); \(\frac{{24}}{{72}} = \frac{{24:24}}{{72:24}} = \frac{1}{3}\); \(\frac{{111}}{{333}} = \frac{{111:111}}{{333:111}} = \frac{1}{3}\); \(\frac{{1212}}{{2424}} = \frac{{1212:1212}}{{2424:1212}} = \frac{1}{2}\)