Вычислите пожалуйста!!!!!!!!
1) ..........=(5/12) / (5/9)=5/12 * 9/5=3/4 2) .....=(1/4) / (1/2)=1/4 * 2/1=1/2 3) ......=(7/15*15/4) / (21/8)=7/4 * 8/21=2/3 4) .........=(1/3) / (2/9)=1/3 * 9/2=3/2=1 1/2