以下有两个问题是我练习pp的时候遇到的,本来以为可以从网路上找到pp破解版,但是却 怎麽找都找不到,所以来这边求救 :) Q1. For which of the following functions f is f(x)=f(1-x) for all x? a. F(x)=1-x b. F(x)=1-x^2 c. F(x)=x^2-(1-x)^2 d. F(x)=x^2(1-x)^2 e. F(x)= x/(1-x) Ans: d. 第一题我完全不知道怎麽写... Q2. A certain library assess fine for overdue books as follow. On the first day that book is overdue, the total fine is $0.1. For each additional day that the book is overdue, the total fine is either increased by $0.3 or doubled, whichever results in the lesser amount. What is the total fine for a book on the 4th day it is overdue? a. 0.6 b. 0.7 c. 0.8 d. 0.9 e. 1.0 Ans. b. 这提我的解法是 第一天 0.1 or 0.1 第二天+0.3 0.2 第三天+0.3 0.3 第四天+0.3 0.3 第二种算法比较便宜 所以答案是0.9, 怎麽算都不是0.7阿?? --- 总觉得这两题好像很简单,却怎麽都写不出来...怀疑自己是不是老了变笨 =____= --

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