1、 充分性题:r, t为非零的数,求r的值? e
(1)r^(t-1)=1
(2)t不等于1
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我的答案是C,请大家指教
2、 An insurance company has a paper record and an electronic record for every claim. For an inaccurate paper record, 60% chances that the electronic record is inaccurate. For an inaccurate electronic record, 75% chances that the paper record is inaccurate. 3% of all the claims are inaccurate both in paper record and in electronic record. Pick one claim randomly, what are the chances that it is both accurate in paper record and in electronic record?
A.97% B.94% C.68% D.65% E.35%
I chose C in the end, but not sure. This one is quite bothering.
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我认为:
0.6X=0.03
0.75Y=0.03
X=0.5
Y=0.4
故我算的答案是91%。但是没有这个答案。请大虾指教
3、等边六边形周长36,以每个边为直径,共6个圆.六边形内有一圆与其他圆相切,求相切外的阴影部分:
答案有:108-27pai;108-36pai;54root3-27pai;27pai-9;54root3-36pai(unsure)
I chose 54root3-27pai, unsure
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我认为:这道题考过太多次了。答案无疑是:54根号3-27π
4、DS 2,4,6,8,10,12,14,16,18,20,22 一个数列8个数在此数列中求标准方差:
(1)该数列的平均数和10个数的平均数一样;
(2)8个数中没有22这个数
Ichose A
感觉数学变难了难题主要是方差和概率
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我认为:答案应该是C。请大虾指教
5、 一道数学题
100磅的水果含99% 的水当尽可能的把水蒸干后,水果is 98% water by weight ,问蒸发掉多少水?
我理解:1/(1+x)=98%,不懂那句英语,费了很长时间
答案:90 80 70 50 40 20
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×(×(这道题实在不明白,估计还会考,请大家出主意。
6、106. k is a 2digit positive integer, the value of k is 6 times of the unit digit, what is the value of k?
(1). the ten digit is 4 greater than unit digit.
(2). the sum of the two digits is a two-digit integer.
[确定]Ans.: D
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这道题许多人都回答D,我有点不明白,这个数不是12,24、36、48。ten Digit不可能比各位大4呀。请大虾指导。
6、106. k is a 2digit positive integer, the value of k is 6 times of the unit digit, what is the value of k?
(1). the ten digit is 4 greater than unit digit.
(2). the sum of the two digits is a two-digit integer.
[确定]Ans.: D
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这道题许多人都回答D,我有点不明白,这个数不是12,24、36、48。ten Digit不可能比各位大4呀。请大虾指导。
6.(2)你把个位数和十位数弄倒了,这几个数在21,42,63,84里选,应该是84
(1)the value of k is 6 times of the unit digit可以求出 十位数/个位数=1/2
设十位数m,个位数n 10m+n=6n m/n=1/2
m-n=4
这个数是84作者: bzbz 时间: 2002-12-20 15:29