Calculate the following expressions: 1. (974 - 561) - (479 - 278) = 2. (75 + 15) + (190 - 180) = 3. (230 + 130) : 60 + 15 = 4. 190 + (267 - 253) * 9 = 5. 117 - 60 * 2 : 40 =

Решение:

1. \( (974 - 561) - (479 - 278) = 413 - 201 = 212 \)
2. \( (75 + 15) + (190 - 180) = 90 + 10 = 100 \)
3. \( (230 + 130) : 60 + 15 = 360 : 60 + 15 = 6 + 15 = 21 \)
4. \( 190 + (267 - 253) \cdot 9 = 190 + 14 \cdot 9 = 190 + 126 = 316 \)
5. \( 117 - 60 \cdot 2 : 40 = 117 - 120 : 40 = 117 - 3 = 114 \)

Ответ: 1. 212; 2. 100; 3. 21; 4. 316; 5. 114.