1: (4 - 1) × 5 + 9
2: ((4 - 1) × 5) + 9
3: (5 × (4 - 1)) + 9
4: 5 × (4 - 1) + 9
5: (5 × (9 - 4)) - 1
6: 5 × (9 - 4) - 1
7: (9 - 4) × 5 - 1
8: ((9 - 4) × 5) - 1
9: 9 + (4 - 1) × 5
10: 9 + ((4 - 1) × 5)
11: 9 + (5 × (4 - 1))
12: 9 + 5 ×(4 - 1)
13: 9 - (5 × (1 - 4))
14: 9 - 5 ×(1 - 4)
15: 9 - (1 - 4) × 5
16: 9 - ((1 - 4) × 5)
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