8. If x, y, p, and q are positive, is x ≥ y ?
(1) px/qy=p/q
(2) xy = p
the answer is a, a只能推出x=y, 这也算推出来吗?19. The table above shows the morning schedule for train X. If Juan took train X on Monday morning, did he arrive at station T on schedule?
(1) Juan arrived at station T on Monday morning 1 hour and 2 minutes after he left station S.
(2) Juan arrived at his office at 8:30 (EST) on Monday morning, which was 20 minutes after he arrived at station T.
the answer is b, i think it is d
2. The price of a television set was reduced by 25 percent. What was its original price?
(1) The reduced price was $187.50.
(2) The original price exceeded the reduced price by more than $60.00.
the answer is a, i think it is D
图片贴不上,麻烦到源文件里看一下 ds19
9. The figure above shows the present position on a radar screen of a sweeping beam that is rotating at a constant rate in a clockwise direction. In which of the four quadrants will the beam lie 30 seconds from now ?
(1) In each 30-second period, the beam sweeps through 3.690°
(2) r = 40
The answer is a, i think it is c, 不确定sweeping beam 的位置,算不出结果呀?
17. If n=p/q where p and q are nonzero integers, is n an integer ?
(1) n^2 is an integer.
(2) (2n+4)/2 is an integer.
the answer is b, i think it is d
请帮忙看一下错在什么地方了作者: himba 时间: 2004-10-18 13:15
8. A可以得到x=y,而题目是要求满足x>=y,条件1和条件2联立也得不到。我也觉得应该选E。19. 没图.2. A。条件2不对。(2) The original price exceeded the reduced price by more than $60.00.说的是more than,呵呵,要看清楚。9. 没图17. 答案是对的,B。条件1不对。比如:n^2=81/3=27是整数,但是n=9/根号下3 不是整数。作者: teyvhf 时间: 2004-10-18 13:18
17. If n=p/q where p and q are nonzero integers, is n an integer ?(1) n^2 is an integer.(2) (2n+4)/2 is an integer.17.答案是对的,B。条件1不对。比如:n^2=81/3=27是整数,但是n=9/根号下3 不是整数17题有严重疑问:n=9/根号下3 不是整数,n的表达式是n=p/q where p and q are nonzero integers,所以n不能等于9/根号下3迷惑作者: hdrtrw112 时间: 2004-10-18 13:19
17, n = p / q, p and q are nonzero integers, is n an integer?1) n^2 is an integer, since n = p / q, then n^2 = p^2 / q^2 and n^2 is an integer, thus n is an integer; because if p / q is not an integer, then p / q * p / q woud not be one as well2) (2n + 4) / 2 is an integer => n + 2 is an integer => n is an integerthus the answer is D
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