(9 + 7) × 2 - 8
1: (2 × (7 + 9)) - 82: 2 × (7 + 9) - 83: (2 × (9 + 7)) - 84: 2 × (9 + 7) - 85: (7 + 9) × 2 - 86: ((7 + 9) × 2) - 87: (9 + 7) × 2 - 88: ((9 + 7) × 2) - 8
2、7、8、9,用这4个数算24点,你能算出来吗?
2 × (7 + 9) - 8