1) x = 7
2) x = 94
3) x = 89
Пошаговое объяснение:
1) 56 : x = (10 + 6) : 2
56 : x = 16 : 2
56 : x = 8
x = 56 : 8
x = 7
2) x - 340 : 10 = 12 * 5
x - 34 = 60
x = 60 + 34
x = 94
3) 484 : 4 + x = 210
121 + x = 210
x = 210 - 121
x = 89
