三个交集并集补集的运算公式
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1. A ∩ A = A
2. A ∩ B = B ∩ A (交换律)
3. A ∩ B ∩ C = A ∩ (B ∩ C) (结合律)
4. A ∩ φ = φ ∩ A = φ
5. A ∩ (B ∪ C) = (A ∩ B) ∪ (A ∩ C) (分配律)
6. A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C) (分配律)
7. A ∪ (A ∩ B) = A
8. A ∩ (A ∪ B) = A
2. A ∩ B = B ∩ A (交换律)
3. A ∩ B ∩ C = A ∩ (B ∩ C) (结合律)
4. A ∩ φ = φ ∩ A = φ
5. A ∩ (B ∪ C) = (A ∩ B) ∪ (A ∩ C) (分配律)
6. A ∪ (B ∩ C) = (A ∪ B) ∩ (A ∪ C) (分配律)
7. A ∪ (A ∩ B) = A
8. A ∩ (A ∪ B) = A
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