Сделайте деяния (3/4+1/20)*1/2; (7/12-1/3)*16/19; (7целых 3/5-2целых 4/15)*9/32; (11/24+1/6)*1целых 3/5);(5целых 1/2+2целых 3/5)*5/9;

(3/4 + 1/20) * 1/2 = (15/20 + 1/20) * 1/2 = 16/20 * 1/2 = 4/5 * 1/2 = 4/10 = 2/5;

(7/12 - 1/3) * 16/19 = (7/12 - 4/12) * 16/19 = 3/12 * 16/19 = 1/4 * 16/19 = 16/76 = 4/19;

(7 3/5 - 2 4/15) * 9/32 = (38/5 - 34/15) * 9/32 = (114/15 - 34/15) * 9/32 = 80/15 * 9/32 =

= 30/20 = 3/2 = 1 1/2;

(11/24 + 1/6) * 1 3/5 = (11/24 + 4/24) * 8/5 = 15/24 * 8/5 = 3/3 = 1;

(5 1/2 + 2 3/5) * 5/9 = (11/2 + 13/5) * 5/9 = (55/10 + 26/10) * 5/9 = 81/10 * 5/9 = 9/2 = 4 1/2;

(7 - 2 5/16) * 4/25 = (112/16 - 37/16) * 4/25 = 75/16 * 4/25 = 3/4.