几个prep题

wayhas · 发表于 2009-6-20 01:38:00

204.
19682-!-item-!-187;#058&012407

On a certain sight-seeing tour, the ratio of the number of women to the
number of children was 5 to 2. What was
the number of men on the sight-seeing tour?

(1) On the sight-seeing tour, the
ratio of the number of children to the number of men was 5 to 11.

(2) The number of women on the sight-seeing tour
was less than 30.

52. 6641-!-item-!-187;#058&005112

In the circle above, PQ is parallel to diameter OR, and OR has length
18. What is the length of minor arc PQ ?

(A) 2∏

(B) 9∏/4

(C) 7∏/2

(D) 9∏/2

(E) 3∏

142.
14580-!-item-!-187;#058&010013[D1]

The rate of a certain chemical
reaction is directly proportional to the square of the concentration of chemical
A present and inversely proportional to the concentration of chemical B
present. If the concentration of
chemical B is increased by 100 percent, which of the following is closest to the
percent change in the concentration of chemical A required to keep the reaction
rate unchanged?

(A) 100% decrease

(B) 50% decrease

(C) 40% decrease

(D) 40% increase

(E) 50% increase

还有20天就考了，半年了每天8+小时的学。。数学还是48，49徘徊。。ver更是一塌糊涂...GWD-TN-24每次都错10个以上。前两天做15套一下错了28个，崩溃啊！！谢谢大家了，帮帮忙解答下，拜托！！

几个prep题

几个prep题

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