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标题: 涛涛31中的3－18和2－29 [打印本页]

作者: mywaymydream 时间: 2006-8-20 09:35
标题: 涛涛31中的3－18和2－29

请问,我原来都作出来的，现在又不清楚了，真是大猪头，怎么考试？

滔滔3 -18

Q18:

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) %

滔滔2套29题,看不懂

If 10⁵⁰ – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?

A. 424

B. 433

C. 440

D. 449

E. 467

作者: hitlzc 时间: 2006-8-20 10:14
http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1757323&id=186412&skin=0

作者: hitlzc 时间: 2006-8-20 10:30

If 10^50 – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?

A. 424
B. 433

C.      440
D.     449
E.      467

意思就是化成10进制数的形式后，所有数的和是多少。

打比方123的和是6

而 10^50 – 74 ，最后两位是26，其余位上的数字均为9，共有50-2＝48个9

所以和为48*9+2+6＝440

作者: mywaymydream 时间: 2006-8-21 04:55

非常感谢，真的。

后天就考试了，我现在真有点紧张。

非常感谢你的帮助。祝你一切顺利。

作者: zihuanzihuan 时间: 2009-8-2 15:06

谢谢

作者: Sophin 时间: 2011-1-18 19:57
方法很好，谢谢~~~

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