为什么我下载的新prep里面的IR两套是一样的?? 有木有大牛有IR的新prep破解版纳?? 有一道数学题不懂: a certain library assesses fines for overdue books as follows.on the first day that a book is overdue,the total fine is 0.1,each additional day that the book is overdue, the total fine is either increased by0.3 or doubled, whicheever result in the lesser amount. what is the total fine for a book on the fourth day it is overdue?> 0.6 0.7 0.8 0.9 1.0 我选了0.8,想好久了都不知道为什么0.7,望指正啊啊 prep有数学破解版吗,我的输血一直没能拿满分,很焦急啊~~~~谢谢NN