Ответ: а) 4/7 * 5/24 : 1 1/14 = 1/91) 4/7 * 5/24 = 5/422) 5/42 : 1 1/14 = 5/42 : 15/14 = 5/42 * 14/15 = 1/9б) 25 * 7/15 : 7/9 = 151) 25 * 7/15 = 35/3 = 11 2/32) 11 2/3 : 7/9 = 35/3 * 9/7 = 15в) 7/18 : 20/21 : 5/12 = 49/501) 7/18 : 20/21 = 7/18 * 21/20 = 49/1202) 49/120 : 5/12 = 49/120 * 12/5 = 49/50г) 5/9 * 2 1/4 : 20 = 1/161) 5/9 * 2 1/4 = 5/9 * 9/4 = 5/4 = 1 1/42) 1 1/4 : 20 = 5/4 * 1/20 = 1/16