12210的24点怎么算

12210算24点怎么算式? -
((10+1)*2)+2 = 24 或者2*((1*2)+10) = 24 供您参考，
1: 9 ÷ 12 × 8 × 4 2: (9 ÷ 12) × 8 × 4 3: (9 ÷ 12 × 8) × 4 4: ((9 ÷ 12) × 8) × 4 5: 9 ÷ 12 ×(8 × 4)6: (9 ÷ 12) × (8 × 4)7: (9 ÷ (12 ÷ 8)) × 4 8: 9 ÷ (12 ÷ 8) × 4 9: 9 ÷ (12 ÷到此结束了？。