1。 当A=(X/x=x), B=(x/x不等于x), and C=(x/x is the element of x) 我们可以问9 种membership questions of these three: A is the member of A, A is the member of B , A is the member of C , B is the member of A , B is the member of B, B is the member of C , C is ........... can anyone give me the answer of these 9 membership questions? www.ddhw.com
哈哈哈哈 O(∩_∩)O哈哈~ 好久不来了，不小心看了一眼自己主页，发现自动关联了自己以往发过的帖，点进这个看了一眼，笑个半死。。。敢情我当初还发过这么搞笑的东西啊，我自己完全不记得了 
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发表于 2005-9-26 22:49:32
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