更新1:
係CROSS (X) 有是UNION !
更新2:
係CROSS (X) 不是UNION !
SET PROBLEM
回答 (1)
2010-09-11 10:17 pm
✔ 最佳答案
x ∈ A ∩ (B ∪ C)<=> x ∈ A and x ∈ (B ∪ C)
<=> x ∈ A and (x ∈ B or x ∈ C)
<=> (x ∈ A and x ∈ B ) or (x ∈ A and x ∈ C )
<=> x ∈ A ∩ B or x ∈ B ∩ C
<=> x ∈ (A ∩ B) ∪ (B ∩ C)
收錄日期: 2021-04-26 14:02:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100910000051KK01464