A total of 100 customers purchased books at a certain bookstore last week.
If these customers purchased a total of 200 books, how many of the customers
purchased only 1 book each?
(1) None of the customers purchased more than 3 books.
(2) 20 of the customers purchased only 2 books each.
答案是C ，可是我覺得很怪，搞不懂
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In the decimal representation of x, where 0 < x < 1, is the tenths digit of x
nonzero?
(1) 16x is an integer.
(2) 8x is an integer.
答案是B ， 我也有大大的疑問
麻煩各位牛牛囉 感謝 :)
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※ 編輯: dolphin100 來自: 140.113.183.10 (08/17 18:30)