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【OG20-P287-392题】
Did the sum of the prices of three shirts exceed $60?
(1) The price of the most expensive of the shirts exceeded $30.
(2) The price of the least expensive of the shirts exceeded $20.
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该题平均耗时:46.63s ,平均正确率:77.3%。
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当前版本由
Helen 更新于2018-09-21 17:03:10 感谢由
Helen 对此题目的解答所做出的贡献。
题干:假设价格x≤y≤z
条件1:z>30,x+y+z不确定,不充分
条件2:x>20,x+y+z≥3x>60,充分
题目讨论 (2条评论)

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必胜必胜必胜
这道题不太严谨吧,如果三件都是20,最便宜的也是20啊,所以可能等于也可能超过60
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0 回复 2020-09-16 18:47:32
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Kath1230
(2) The price of the least expensive of the shirts exceeded $20. 最便宜的都出来了,那么另外两个数 肯定比20大或者等于最便宜的,加起来肯定大于60啊。。。
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0 回复 2019-02-10 17:00:41