а) 92x – 38x, если x = 31
1) 92x – 38x = 54x
2) 54 ⋅ 31 = 1674
Ответ: 1674
б) 37a + 14a – 11a, если a = 294
1) 37a + 14a – 11a = 40a
2) 40 ⋅ 294 = 11760
Ответ: 11760
в) 18z – 12z + 4z – 172, если z = 180
1) 18z – 12z + 4z = 10z
2) 10 ⋅ 180 = 1800
3) 1800 – 172 = 1628
Ответ: 1628
г) 25(8x + 4), если x = 137
1) 25 ⋅ (8x + 4) = 200x + 100
2) 200 ⋅ 137 + 100 = 27400 + 100 = 27500
Ответ: 27500
д) 13(5t – 10), если t = 25
1) 13 ⋅ (5t – 10) = 65t – 130
2) 65 ⋅ 25 – 130 = 1625 – 130 = 1495
Ответ: 1495