第1个回答 推荐于2021-02-03
1: (9 + 5 - 2) × 2 2: ((9 + 5) - 2) × 2 3: (9 + (5 - 2)) × 2 4: (9 - 2 + 5) × 2 5: ((9 - 2) + 5) × 2 6: (9 - (2 - 5)) × 2 7: (5 + 9 - 2) × 2 8: ((5 + 9) - 2) × 2 9: (5 + (9 - 2)) × 2 10: (5 - 2 + 9) × 2 11: ((5 - 2) + 9) × 2 12: (5 - (2 - 9)) × 2
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