Re: [問題] PP 數學請教
※ 引述《KMI (無奈)》之銘言：
: DS: 剛剛模考做到
: A certain one-day seminar consisted of a morning session and an afternoon
: session. If each of the 128 people attending the seminar attended at least
: one of the two sessions,
: how many of the people attended the morning session only?
^^^^
: 1) 3/4 of the people attended both sessions.
: 2) 7/8 of the people attended the afternoon session.
: 答案: B
解法：128= M(only morning) + A(only afternoon) - MA(both morning + afternoon)
求 M?
(1)3/4 * 128 = MA
(2)7/8 * 128 = A + MA → 1/8 *128 = M
所以(2)即可得答案，充份!! 選B
<我覺得畫圓餅圖看就會很清楚喔>
: A certain city with a population of 132,000 is to be divided into 11 voting
: district, and no district is to have a population that is more than 10%
: greater than the population of any other district. What is the minimum
: possible population that the least populated district could have?
: 1. 10700
: 2. 10800
: 3. 10900
: 4. 11000
: 5. 11100
: 答案: D
解法：設最小的district為x 其餘為y(假設其他一樣多人)
x + 10y =132,000 ------1式
y ≧ 1.1x ------2式
把2式代入1式中
得11000≧x 求出答案 D
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09/27 21:42, , 1F
09/27 21:42, 1F
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