Дано: \( a = 1, b = -1 \) или \( a = 2, b = -3 \) или \( a = -1, b = -1 \).
| Выражение | a = 1, b = -1 | a = 2, b = -3 | a = -1, b = -1 |
| 1) 2a + b | \(2(1) + (-1) = 2 - 1 = 1\) | \(2(2) + (-3) = 4 - 3 = 1\) | \(2(-1) + (-1) = -2 - 1 = -3\) |
| 2) 2(a + b) | \(2(1 + (-1)) = 2(0) = 0\) | \(2(2 + (-3)) = 2(-1) = -2\) | \(2(-1 + (-1)) = 2(-2) = -4\) |
| 3) 2a + b² | \(2(1) + (-1)² = 2 + 1 = 3\) | \(2(2) + (-3)² = 4 + 9 = 13\) | \(2(-1) + (-1)² = -2 + 1 = -1\) |
| 4) 2(a + b²) | \(2(1 + (-1)²) = 2(1 + 1) = 2(2) = 4\) | \(2(2 + (-3)²) = 2(2 + 9) = 2(11) = 22\) | \(2(-1 + (-1)²) = 2(-1 + 1) = 2(0) = 0\) |
| 5) 2(a + b)² | \(2(1 + (-1))² = 2(0)² = 0\) | \(2(2 + (-3))² = 2(-1)² = 2(1) = 2\) | \(2(-1 + (-1))² = 2(-2)² = 2(4) = 8\) |
| 6) 2a² + b | \(2(1)² + (-1) = 2(1) - 1 = 2 - 1 = 1\) | \(2(2)² + (-3) = 2(4) - 3 = 8 - 3 = 5\) | \(2(-1)² + (-1) = 2(1) - 1 = 2 - 1 = 1\) |
| 7) 2(a² + b) | \(2(1² + (-1)) = 2(1 - 1) = 2(0) = 0\) | \(2(2² + (-3)) = 2(4 - 3) = 2(1) = 2\) | \(2((-1)² + (-1)) = 2(1 - 1) = 2(0) = 0\) |
| 8) 2a² + b² | \(2(1)² + (-1)² = 2(1) + 1 = 2 + 1 = 3\) | \(2(2)² + (-3)² = 2(4) + 9 = 8 + 9 = 17\) | \(2(-1)² + (-1)² = 2(1) + 1 = 2 + 1 = 3\) |