作者noodle0909 (麵麵具到)
看板GMAT
標題[計量] PP數學問題
時間Wed May 26 22:01:59 2010
1. if n= X * 10^2+Y * 10+Z where X Y Z are positive nonzero digits,
which of the following must be true?
(3) The difference beteween the greatest possible value of n and the least
possible value of n is 864.
答案有給(3)
為什麼? 若最大值為 9* 107* 18 - 最小值 1* 103* 12答案就大於864也
還是說最大最小值我想的就是錯的?
2. Because the decimal point was misplaced in the amount of a customer's bill
the customer was overcharged. which of the following could NOT have been the
amount of the overcharge?
(a)$0.70 (b)$0.90 (c)$1.80 (d)$9.90 (e)$90.00
麻煩會的人解答一下
感激不盡!!!!
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→ dreamD:第一題XYZ分別為不同個位數 故max-min=987-123=864 05/26 22:20
→ dreamD:第2題小數點錯置 原價X可能會變10X,0.1X故非9的倍數A不可能 05/26 22:29
→ noodle0909:喔喔喔!!!!謝謝! 05/26 22:31
推 chen0314:第一題應該要再加一個條件 就是xyz三個不相等 這樣才會像 05/26 22:33
→ chen0314:一樓說的 如果三個可以一樣就變999-111=888 05/26 22:33
→ noodle0909:可是為什麼n=987或123?不是應該為前面給的三個東西相乘 05/26 22:35
→ dreamD:其實我是看到digit"s"才會認為XYZ是不同3個數啦XD 05/26 22:37
→ chen0314:我沒看到"s"耶 XD 05/26 23:01
推 cowabunga216:n的式子長得好亂= = (n=100X+10Y+Z???) 06/02 16:22
推 cowabunga216:這邊看沒有~@@(9* 107* 18 - 1* 103* 12) 06/02 16:24