1)1/3 / 1/9,2)3/8 / 1/2,3)4/9 / 8/9,4)1/12 / 1/6,5)3/5 / 1/25,6)2/7 / 3/7,7)1/10 / 1/10,8)3/4 / 5/8.

1) 1/3 : 1/9 = 1/3 * 9/1 = (1*3)/(1*1) = 3 2) 3/8 : 1/2 = 3/8 * 2/1 = (3*1)/(4*1) = 3/4 3) 4/9 : 8/9 = 4/9 * 9/8 = (1*1)/(1*2) = 1/2 4) 1/12 : 1/6 = 1/12 * 6/1 = (1*1)/(2*1) = 1/2 5) 3/5 : 1/25 = 3/5 * 25/1 = (3*5)/(1*1) = 15 6) 2/7 : 3/7 = 2/7 * 7/3 = 2/3 7) 1/10 : 1/10 = 1/10 * 10/1 = 10/10 = 1 8) 3/4 : 5/8 = 3/4 * 8/5 = (3*2)/(1*5) = 6/5 = 1 целая 1/5