求助数学的两个小盲点

gohomebest2 · 发表于 2011-4-30 21:05:57

各位大侠不要嫌我智商第哈~
1、a is three times more than b. a是b的三倍还是四倍啊
2、Last year the price per share of Stock X increased by k percent and the earnings per share of Stock X increased by m percent, where k is greater than m. By what percent did the ratio of price per share to earnings per share increase, in terms of k and m?
A. k/m %
B. (k-m) %
C. [100(k-m)]/(100+k) %
D. [100(k-m)]/(100+m) %
E. [100(k-m)]/(100+k+m) %
Answer: 这道题好晕啊

韩Q · 发表于 2011-5-1 21:24:03

第二题，应该是C
解答：假设去年的Price(P)是A,earning(E)是B
那么今年的P1是A(100+K)/100,E1是B（100+m）/100
可得：ratio=[P1/E1-P/E]/（P/E）
因为k>m,所以取正得C

hejingzhou · 发表于 2011-5-1 22:34:32

第一题4倍

cutemushroom · 发表于 2011-5-2 10:46:42

应该选D吧

求助数学的两个小盲点

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