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1: 4 × (9 + 9 - 12)
2: 4 × ((9 + 9) - 12)
3: 4 × (9 + (9 - 12))
4: 4 × (9 - 12 + 9)
5: 4 × ((9 - 12) + 9)
6: 4 × (9 - (12 - 9))
7: (4 - 12 ÷ 9) × 9
8: (4 - (12 ÷ 9)) × 9
9: 9 × (4 - 12 ÷ 9)
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