Re: [計量] 又來請教囉
※ 引述《yauu (真無雙亂舞)》之銘言：
: If N is the average (arithmetic mean) of five numbers, which of the
: following must be true?
: I. At least one of the five numbers is greater than or equal to N.
: II. At least one of the five numbers is less than or equal to N.
: III. At least two of the five numbers are greater than or equal to N.
: (A) I only
: (B) II only
: (C) I and II only
: (D) I and III only
: (E) I, II, and III
I AND II 一定成立 因為是算數平均 III不一定 如果五個數 有一個很大 其他都很小
那就不成立了 EX: 100, 1, 2, 3, 4 N=22.
: Ans:(C)
: For which of the following pairs of integers is the least common multiple
: of the integers minus their greatest common divisor the greatest?
: (A) 3,12
: (B) 5,6
: (C) 10,20
: (D) 11,12
: (E) 15,30
: Ans:(D)
對於A C E 它們的共同最大因數都是第一個數字 而共同最小倍數為第二個數字
所以直接相減就可以了 B 最大因數為1 而最小倍數為 30
C 最大因數為1 而最小倍數為 132
: Circles R,S, and T are in the same plane, have a common center, and have
: radii r,s, and r+s, respectively, where 0<r<s.
: Column A The area of the region whose boundary consists of circles R and T
: Column B 拍s^2 (抱歉不會打圓周率)
: Ans: (A)
從題目可得知 T>S>R (面積)
所以Column A : pi*(r+s)^2-pi*s^2+pi*r^2
可得知Column A 大
: 謝謝!
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