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prep 2-ds-113

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楼主
发表于 2008-7-4 20:51:00 | 只看该作者

prep 2-ds-113

In a certain year the United Nations' total expenditures were $1.6 billion. Of this amount, 67.8 percent was paid by the 6 highest-contributing countries, and the balance was paid by the remaining 153 countries. Was Country X among the 6 highest-contributing countries?

(1) 56 percent of the total expenditures was paid by the 4 highest-contributing countries, each of which paid more than Country X.


(2) Country X paid 4.8 percent of the total expenditures.
Answer: E
沙发
发表于 2008-7-4 22:03:00 | 只看该作者

prep ds-2-64

If a < y < z < b, is |y - a | < |y - b | ?

 

(1) |z - a | < |z - b |

 

(2) |y - a | < |z - b |

ans    请教思路~~~~

 

板凳
发表于 2008-7-4 22:12:00 | 只看该作者
以下是引用SharonYao330在2008-7-4 22:03:00的发言:

prep ds-2-64

If a < y < z < b, is |y - a | < |y - b | ?

(1) |z - a | < |z - b |

(2) |y - a | < |z - b |

ans    请教思路~~~~

这题好像比较简单,根据题干条件,分别去绝对值符号就可以推出,1,2两个条件都可以推出a+b>2y故选D。

地板
发表于 2008-7-4 22:18:00 | 只看该作者
以下是引用SharonYao330在2008-7-4 22:03:00的发言:

prep ds-2-64

If a < y < z < b, is |y - a | < |y - b | ?

(1) |z - a | < |z - b |

(2) |y - a | < |z - b |

ans    请教思路~~~~

在直线上画一下就清楚了

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