Re: [計量]pp2-ds-57
※ 引述《foxowlcat (barbara )》之銘言:
: 57. 4761-!-item-!-187;#058&003968
: A certain list consists of several different integers. Is the product of all
: the integers in the list positive?
: (1) The product of the greatest and smallest of the integers in the list is
: positive.
: (2) There is an even number of integers in the list.
: 答案:C
: 想問一下(2)怎麼和(1)合併呢? 覺得很怪
: (2)是說共有偶數個整數 那為什麼就可以和(1)合併 得到答案,非常不能理解
: 麻煩各位了謝謝
兩者合併
(1)可得知全部數字皆同號
(2)可得知有偶數個數字
偶數個同號的數字相乘
其積必為正
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