和大家讨论几道数学狗，明天考

wangyizhu959 · 发表于 2010-12-28 21:59:46

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sdcar2010 · 发表于 2010-12-29 00:28:58

Since they ask for minimum, we let institutional investors to buy domestic ONLY. So institutional investors bought 3/5 of the total. The rest of the domestic 3/4 - 3/5 = 3/20 would be bought by the individual investors .

[3/20]/[3/4]=1/5 So individual investors bought at least 1/5 of the domestic trading volumes.

In terms of value, 340 * 3/30 = 51

sdcar2010 · 发表于 2010-12-29 00:34:18

DS：一个球从斜坡上滚下来，斜坡的长度d与球从坡顶滚到坡地的时间t满足d=t平方。问能否求出球在第一秒内的平均速度和最后一秒内的平均速度之差。
（1）已知坡长25feet
（2）已知总共用了5s
这个我选D

This is simple. Both conditions are the same since 25= 5^2.

At the end of the first second, d = 1 ft. So the v1 average = 1/1 = 1 ft/s
At the end of the 4th second, d = 16 ft. At the end of the 5th second, d = 25 ft. So during the last second, the ball covers 25-16 = 9 ft. So the v5 average = 9/1 = 9 ft/s.

The different between the two is 8 ft/s.

Choose D.

sdcar2010 · 发表于 2010-12-29 01:10:34

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smartsix · 发表于 2010-12-29 01:48:49

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sdcar2010 · 发表于 2010-12-29 02:01:05

From the stimulus, you can deduce that B=2*A, C=3*A, D=2*B = 4*A since each segment in-between the adjacent points are equal.

1) A = 2^6, then D = 2^8. So D is 2^8. Sufficient.
2) B = 2*9, then D = 2^10. So D is not 2^8. Sufficient.

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和大家讨论几道数学狗，明天考

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