Номера 1,2,3. Спасибо!!! ,

Решение 1.  1) - 12(2/3) : (- 5(1/3) = (38 * 3)/(3*16) = 38/16 = 19 / 8 2( (19*4,2)/8 = 79,8 / 8 = 9,975 2. x : (-5,75) = 4/3 x = (4/3)*(- 5,75) x = - (4*5,75)/3 x = - 23/3 x = - 7(2/3) 3. 1)  14(8/11) : 26/77 = (162 * 11) / (77*26) = 162/(7*26) =  = 81/ (7*13) = 81/ 91 2) 81/91 : 405 = 81 / (91* 405) = 5 / 91