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3ks & bless lz also 4、K是prime number, K,K+2,K+4是质数,K有多少个? 0 1 2 3 more than 3。 我选了2。这个题大家论证下。我当时用笨方法。3,5,7是一个,后来我怎么还推出一个。看来是不对的。
I think the answer should be 1. just k=3. it is easy to prove that every three consecutive odd numbers must have a number which can be dividable by 3...
6、三角形ABC,BC边高为h,三边长分别为a,b,c. ?角ACB的度数? (1)ab=ch (2)角ABC=30度 选A。以前狗里AB=CH 让人误解为AB边长等于高CH,引发很多讨论。对的。
I think C is the answer, (1) only tells you 角BAC is 90, right ?
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