看懂句子的意思了没,问的是一个是一个奇数两倍的偶数.
2k只是一个偶数,如果k也是偶数,那么2k就不是一个奇数的两倍了.
而2k+1一定是一个奇数,所以它的两倍,4k+2,一定是一个偶数,并且是一个奇数的两倍.
sat 1if k is a positive integer,which of the following must
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