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