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发表于 2011-10-18 00:13

发表于 2011-10-18 00:18
这个方法老师讲过呢,貌似
看来是应试必学,呃,我刚才也是无聊才突然想这些东西,
老师讲这些还是会比较正经的...
,如果允许的话,能发现这个代数字那就更容易判断了。
嘿嘿