A certain list of several different integers. Is the product of all the integers in the list positive?
(1) The product of the greastest and smallest of the integers in the list is positive
(2) There is an even number of integers in the list.
我选E,但答案是C。
我尤其不明白第二个条件有什么用?even number 也是可正可负的亚?
第一个条件说明所有的数符号相同
第二个条件说明一共有偶数个数
加起来就能判断是正了
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