A)1 2/3 * 2 2/5 = 5/3 * 12/5 = 4
б) 1 5/7 * 1 = 1 5/7
в) 3 1/4 * 4 = 13/4 * 4 = 13
г) 7 3/11 * 2 19/40 = 80/11 * 99/40 = 18
д) 4/9 * 2 3/4 = 4/9 * 15/4 = 5/3 = 1 2/3
е) 10 * 5 2/5 = 10 * 27/5 = 54
ж) 2 1/2 * 2 2/15 = 5/2 * 32/15 = 16/3 = 5 1/3
з) 6 2/3 - 1 2/5 = 6 10/15 - 1 6/15 = 5 4/15
и) 3 3/4 + 4 7/9 = 3 27/36 + 4 28/36 = 7 55/36 = 8 19/36
к) 11 5/8 + 8 5/6 = 11 15/24 + 8 20/24 = 19 35/24 = 20 11/24