第1题:(PS题)6个人围坐圆桌。题目中给出了一种排序情况,问这种排序情况的概率是多少?答案:1/120知识点:排列组合的考查形式8——圆桌排座公式:(A_n^n)/n
= n!/n = (n-1)!
例题1:At a dinner party, 5 people are to be seated around a circular table.
Two seating arrangements are considered different only when the positions of the
people are different relative to each other. What is the total number of
different possible seating arrangements for the group?(A) 5 (B) 10 (C) 24 (D) 32
(E) 120
答案:C
第2题:(DS题)If x、y、x are three consecutive odd integers, and x
解题思路:(1):连续的3个都是质数的只有3,5,7。 sufficient
(2):x,y,z是连续的奇数整数,则y=x + 2,z = x + 4x+y+z<60,即 x < 18无法确定数值。
答案:A
第3题:(PS题)If rs>0, which of the following cannot be true?答案: r<0
解题思路:有题可知r、s同号,因此r<0
第4题:(PS题)算一个角的度数,反正就是列两个等式,虽然有3个未知数,但是不影响求解,因为两个都有x+k,但是要求Y
解题思路:题目待补充,看构筑描述感觉不难,大家考场细心就行
第5题:(PS题)一个直角三角形,侧边是7、24,求斜边的长度?
答案: 25
知识点:三角形的性质3——勾股定理单词:equilateral triangle 等边三角形isosceles triangle 等腰三角形right
triangle 直角三角形hypotenuse斜边leg侧边
性质:直角三角形:a^2 + b^2 =c^2锐角三角形:a^2 + b^2 > c^2钝角三角形: a^2 + b^2 <
c^2相似真题:A ladder 25 feet long is leaning against a wall that is perpendicular to
level ground. The bottom of the ladder is 7 feet from the base of the wall. If
the top of the ladder slips down 4 feet, how many feet will the bottom of the
ladder slip?(A) 4 (B) 5 (C) 8 (D) 9 (E) 15答案:C
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