作者chenemily (天天保持好心情)
看板GMAT
标题[问题] pp1-ps-167,188,190
时间Wed Oct 7 23:56:52 2009
请问一下这3题数学
167.
If x is positive, which of the following could be the correct ordering of
: 1/x,2^x, and x^2 ?
:(a) x^2 < 2^x < 1/x
:(b) x^2 < 1/x < 2^x
:(c) 2^x < x^2 <1/x
答案只有a&b 我知道这要代数字进去
但要怎要带比较快?
188.
Last month 15 homes were sold in Town X. The average (arithmetic mean) sale
price of the homes was $150,000 and the median sale price was $130,000.
Which of the following statements must be true?
I.At least one of the homes was sold for more than 165,000
II.At least one of the homes was sold for more than 130,000 and less than
150,000
III. At least one of the homes was sold for less than 130,000
(A)I only
(B)II only
(C)III only
(D)I and II
(E)I and III
答案是A
190.
Pumps A, B, and C operate at their respective constant rates. Pumps A and B,
operating simultaneously,can fill a certain tank in 6/5 hours; pumps A and C,
operating simultaneously, can fill the tank in 3/2 hours;
and pumps B and C, operating simultaneously, can fill the tank in 2 hours.
How many hours does it take
pumps A, B, and C, operating simultaneously, to fill the tank?
答案是1
不好意思 问题有点多
谢谢 麻烦一下
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1F：→ stephanini:188题III不可以吗? 10/08 00:34
2F：→ stephanini:喔不行 不要理我@@" 10/08 00:37