А)14/15 * 10/49 + 5 3/7 б)1 3/11 - 27/44 * 4/9 в)1 2/3 + 14/15 * 5/7

А) 14/15*10/49+ 5 3/7 = 4/21 + 5 3/7 = 4/21 + 5 9/21 = 5 13/21
б) 1 3/11 - 27/44 * 4/9 = 1 3/11 - 3/11 = 1
в) 1 2/3 + 14/15 * 5/7 = 1 2/3 + 2/3 = 1 4/3 = 2 1/3