3, 8, 12, 12的24点答案：1:3 × 8 + 12 - 122:(3 × 8) + 12 - 123:(3 × 8 + 12) - 124:((3 × 8) + 12) - 125:3 × (8 + 12 - 12)6:3 × ((8 + 12) - 12)7:3 × (8 + (12 - 12))8:3 × 8 +(12 - ...