5, 4, 9, 3的24点答案：
1:(5 × 3 - 9) × 4
2:((5 × 3) - 9) × 4
3:(4 - 5 + 9) × 3
4:((4 - 5) + 9) × 3
5:(4 - (5 - 9)) × 3
6:4 × (5 × 3 - 9)
7:4 × ((5 × 3) - 9)
8:(4 + 9 - 5) × 3
9:((4 + 9) - 5) × 3
10:(4 + (9 - 5)) × 3
11:4 × (3 × 5 - 9)
12:4 × ((3 × 5) - 9)
13:(9 - 5 + 4) × 3
14:((9 - 5) + 4) × 3
15:(9 - (5 - 4)) × 3
16:(9 + 4 - 5) × 3
17:((9 + 4) - 5) × 3
18:(9 + (4 - 5)) × 3
19:(3 × 5 - 9) × 4
20:((3 × 5) - 9) × 4
21:3 × (4 - 5 + 9)
22:3 × ((4 - 5) + 9)
23:3 × (4 - (5 - 9))
24:3 × (4 + 9 - 5)
25:3 × ((4 + 9) - 5)
26:3 × (4 + (9 - 5))
27:3 × (9 - 5 + 4)
28:3 × ((9 - 5) + 4)
29:3 × (9 - (5 - 4))
30:3 × (9 + 4 - 5)
31:3 × ((9 + 4) - 5)
32:3 × (9 + (4 - 5))