Пошаговое объяснение:
3. х = 5 29/30
4. 1) 12
3. 8 7/10 - х = 2 11/15
х = 8 7/10 - 2 11/15
х = 87/10 - 41/15
х = (87*3-41*2)/30
х = (261 - 82)/30
х = 179/30
х = 5 29/30
Проверим:
8 7/10 - 5 29/30 = 2 11/15
87/10 - 179/30 = 2 11/15
(87*3 - 179)/30 = 2 11/15
(261-179)/30 = 2 11/15
82/30 = 2 11/15
41/15 = 2 11/15
2 11/15 = 2 11/15 - верно
4. х - 3 8/15 = 8 7/15
х = 8 7/15 + 3 8/15
х = 11 15/15
х = 12
Пошаговое объяснение:
3. х = 5 29/30
4. 1) 12
Пошаговое объяснение:
3. 8 7/10 - х = 2 11/15
х = 8 7/10 - 2 11/15
х = 87/10 - 41/15
х = (87*3-41*2)/30
х = (261 - 82)/30
х = 179/30
х = 5 29/30
Проверим:
8 7/10 - 5 29/30 = 2 11/15
87/10 - 179/30 = 2 11/15
(87*3 - 179)/30 = 2 11/15
(261-179)/30 = 2 11/15
82/30 = 2 11/15
41/15 = 2 11/15
2 11/15 = 2 11/15 - верно
4. х - 3 8/15 = 8 7/15
х = 8 7/15 + 3 8/15
х = 11 15/15
х = 12