3. Реши примеры. 2 x 3+67-19= 5 x 2-4 +68 = 100 - 34 - 27 + 49 - 90 =

Решение:

1. \( 2 \times 3 + 67 - 19 = 6 + 67 - 19 = 73 - 19 = 54 \)
2. \( 5 \times 2 - 4 + 68 = 10 - 4 + 68 = 6 + 68 = 74 \)
3. \( 100 - 34 - 27 + 49 - 90 = 66 - 27 + 49 - 90 = 39 + 49 - 90 = 88 - 90 = -2 \)

Ответ: 54, 74, -2.