The annual rent collected by a corporation from a certain building was x percent more in 1998 than in 1997 and y percent less in 1999 than in 1998. Was the annual rent collected by the corporation from the building more in 1999 than in 1997?
(1) x > y
(2) (xy/100)< x – y
答案给的B. 我觉得是不是应该选D啊? 请牛人指点,谢谢
设1997年为A,98年为B,99年为C,则根据已知条件可以写成:
(1)(B-A)/A=X%--->A=B/(1+X%)
(2)(C-B)/B=-Y%--->C=(1-Y%)B
求(C-A)/A的正负
即求[(1-Y%)B-B/(1+X%)]/[B/(1+X%)]=(X-Y)/100-(XY/100)
条件(2)可好可以求解.但条件(1)只能知道(X-Y)的正负,但没办法判断与XY
的大小
如果传说说得对,可考场上来不及这么认真,我觉得:题里没有说X,Y必须为正值,所以,漏洞多多,A必然错。
而且这题是考全世界的,要知道全世界的傻瓜多多啊!每道题都设置两三重障碍,那傻瓜还不疯了?
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