PREP 几道题目求解 DS1 36: 36. 3130-!-item-!-187;#058&003116 If x is positive, is x > 3 ? (1) (x - 1)^2> 4 (2) (x - 2)^2 > 9 我认为在1或者2选项里面都有X-1是负值的情况,所以都不能确定X的取值啊,比如1,X 应该是大于3或者小于-2啊,请指教。 PS1, 83题目不理解: 83. 9589-!-item-!-187;#058&00666 The table above shows the distribution of test scores for a group of management trainees. Which score interval contains the median of the 73 scores? (A) 60-69 (B) 70-79 (C) 80-89 (D) 90-99 (E) It cannot be determined from the information given.
PS1 87题 87. 9993-!-item-!-187;#058&007019 In the addition table shown above, what is the value of m + n ?
(A) -19 (B) 4 (C) 5 (D) 6 (E) 22 下面是83和87题目的图表[attachimg]71190[/attachimg]
[此贴子已经被作者于2009-5-24 19:58:52编辑过] |