а) 7 14/19 + 8 15/19 - 3 11/19 = 7 + 8 - 3 + 14/19 + 15/19 - 11/19= 12 + 18/19 - 11/19= 12 + 7/19Ответ: 12 7/19
б) 5 8/33 - 4 18/33 + 15 28/33 = 5 - 4 + 8/33 - 18/33 + 15 + 28/33= 1 - 10/33 + 15 + 28/33= 16 - 10/33 + 28/33= 16 + 18/33= 16 18/33Ответ: 16 18/33
в) 4 26/57 - (8 19/57 - 8 45/57) = 4 26/57 - 8 19/57 + 8 45/57= 4 - 8 + 26/57 - 19/57 + 45/57= -4 + 7/57 + 45/57= -4 + 52/57Ответ: -4 52/57
г) 81/x = 981 = 9xx = 81/9x = 9Ответ: x = 9
а) 7 14/19 + 8 15/19 - 3 11/19 = 7 + 8 - 3 + 14/19 + 15/19 - 11/19
= 12 + 18/19 - 11/19
= 12 + 7/19
Ответ: 12 7/19
б) 5 8/33 - 4 18/33 + 15 28/33 = 5 - 4 + 8/33 - 18/33 + 15 + 28/33
= 1 - 10/33 + 15 + 28/33
= 16 - 10/33 + 28/33
= 16 + 18/33
= 16 18/33
Ответ: 16 18/33
в) 4 26/57 - (8 19/57 - 8 45/57) = 4 26/57 - 8 19/57 + 8 45/57
= 4 - 8 + 26/57 - 19/57 + 45/57
= -4 + 7/57 + 45/57
= -4 + 52/57
Ответ: -4 52/57
г) 81/x = 9
81 = 9x
x = 81/9
x = 9
Ответ: x = 9