3377算24分

2: (3 + (3 ÷ 7)) × 7

3: (3 ÷ 7 + 3) × 7

4: ((3 ÷ 7) + 3) × 7

5: 7 × (3 + 3 ÷ 7)

6: 7 × (3 + (3 ÷ 7))

7: 7 × (3 ÷ 7 + 3)

8: 7 × ((3 ÷ 7) + 3)

给你一个网站，很快就出来了:/tool/24.htm。