Упростите выражение: 1) 5/8a * 4/15b 2) 6 3/4x * 1 11/45y; 3) 13/24d * 32c 4) 18 1/3a * 1 2/11b * 9/13c

1) (5 : 5)/(8а : 4) * (4 : 4)/(15b : 5) = 1/2a * 1/3b= 1/6ab.Ответ: 1/6ab.2) 6 3/4x * 1 11/45y = 27/4x * 56/45y= (27 : 9)/(4x : 4) * (56 : 4)/(45y : 9) = 3/x * 14/5y = 42/5xy = 8 2/5xy.Ответ: 8 2/5ху.3) 13/24d * 32c = 13/24d * 32c/1 = 13/(24d : 8) * (32c : 8)/1 = 13/3d * 4c/1 = 52c/3d = 17 1c/3d.Ответ: 17 1с/3d.4) 11 1/3a * 1 2/11b * 9/13c = 34/3a * 13/11b * 9/13c = 34/(3a : 3) * (13 : 13)/11b * (9 : 3)/(13c : 13) = 34/a * 1/11b * 3/c = 102/11abc = 9 3/11abc.Ответ: 9 3/11abc.