225. f = x - 1/x, so f equal to which of following? A. f, B. 1/x, C. -f Ans: C
226. In a systematics with mean as M, 68% characters wthin the standard deveation D, what percentage is M + D? Ans: 50%+34%=84%
227. In a school, the ratio of the number of second grade students to fouth grade students is 3 to 2, the ratio of the first grade students to second grade students is 1 to 3, the ratio of the third grade students to fourth grade students is 1 to 3. What is the ratio of first grade students to third grade students? Ans: 3 to 2. .
228. 一个货轮上有8个电视机,2个黑白的,6个彩色的,如果从中随机任选2个,其中至少有一个是黑白的概率?
答案:1-=13/28
229. 大小同心圆中间环状的面积是小圆的三倍,则大圆直径是小圆直径的多少?
答案:2倍
230.N是数字1至8的乘积,也可以表示成,问m+n+p+q等于几?
答案:7+2+1+1=11
231. 9个委员中选4个委员组成委员会,不考虑顺序,问几种选法?C94=126
232. DS, 租车公司J一天租车收$15,每迈另收0.2$。 租车公司K一天收$20,每迈另收0.1$。
问从公司J租车开X迈少于$25?X50公司K租车开X迈,少于$25 答案:D
同107题 见2005年09月数学机经讨论稿第四篇 09/16更新
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