以下有兩個問題是我練習pp的時候遇到的,本來以為可以從網路上找到pp破解版,但是卻 怎麼找都找不到,所以來這邊求救 :) 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. 第一題我完全不知道怎麼寫... 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. 這提我的解法是 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 第二種算法比較便宜 所以答案是0.9, 怎麼算都不是0.7阿?? --- 總覺得這兩題好像很簡單,卻怎麼都寫不出來...懷疑自己是不是老了變笨 =____= --

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