Решение
1) 40 + x = 560 - 220
x = 340 - 40
x = 300
2) 1000 - y = 256 + 154
y = 1000 - 410
y = 590
5 7/8 + 2 5/12 = 8 7/24
8 = 2 × 2 × 2
12 = 2 × 2 × 3
НОК = 8 × 3 = 24
5 7 × 3/24 + 2 5 × 2/24 = 5 + 2 21 + 10/24 = 7 31/24 = 8 7/24
936 | 8
-----------
117
8
------
13
8
------
56
56
------
0