Ответ:\(\frac{12}{16}=\frac{12:4}{16:4}=\frac{3}{4}\).\(\frac{18}{27}=\frac{18:9}{27:9}=\frac{2}{3}\).Ответ: 1) \(\frac{3}{4}\); 2) \(\frac{2}{3}\).