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在坛子里没有搜到这几个。。 烦请路过的NN帮我看一下。。
170.
18339-!-item-!-187;#058&011871 For any triangle T in the xy-coordinate plane, the center of T is defined to be the point whose x-coordinate is the average (arithmetic mean) of the x-coordinates of the vertices of T and whose y-coordinate is the average of the y-coordinates of the vertices of T. If a certain triangle has vertices at the points (0,0) and (6,0) and center at the point (3,2), what are the coordinates of the remaining vertex?
(A) (3,4) (B) (3,6) (C) (4,9) (D) (6,4) (E) (9,6) 这题我似乎没理解题意：是说该三角形中心的纵坐标是三角形定点纵坐标的平均值吗？ 我是这么理解的所以选的A..
33. 4484-!-item-!-187;#058&004004 If x^4 + y^4 = 100, then the greatest possible value of x is between
(A) 0 and 3 (B) 3 and 6 (C) 6 and 9 (D) 9 and 12 (E) 12 and 15 按说是Y=0时，X^4可以取到最大值3，那怎么会x在3～6之间呢？
77. 9031-!-item-!-187;#058&006222 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 relative to each other...means what??  先谢过NN了。。 | 
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发表于 2008-5-22 18:18:00
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