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标题: [求助]math [打印本页]

作者: jackco 时间: 2002-10-27 14:31 标题: [求助]math

G friends, please tell me how to solve "f(n)=2^x*3^y*5^z,x/y/z为n的百,十,个位，x，y，z都是正整数，f(m)=9f(v),
问m-v=? especially the clues to solve the problem, thanks a lot!
[em27]

作者: 猫猫头 时间: 2002-10-27 14:40

参阅前JJ，我有详细过程：P

作者: jackco 时间: 2002-10-27 14:47

小石猫, please tell me again, I couldn't find the previous JJ, thank you very much. Also, could you tell me the password of 9-month JJ, I could not open it without the password. thanks again.

作者: 猫猫头 时间: 2002-10-27 14:53

因为f(m)=9f(v),所以f(m)中3的次数比f(v)中多2（3^2)
所以设f(n)=2^x*3^y*5^z,f(v)=2^x'*3^y'*5^z'
coz y'-y=2===>100x+10y+z-100x'-10y'-z'=10*2(pay attention that x=x',z=z')

作者: jackco 时间: 2002-10-27 15:11

小石猫, I got it, thank you very much!!

作者: 猫猫头 时间: 2002-10-27 15:16

不客气，你得叫我猫猫头

作者: jackco 时间: 2002-10-27 16:01

猫猫头, thank you again, but could you tell me how to open the 9-month JJ?
I downloaded it, but I could not open it without password, where can I find the password? please help me get out of the trouble. thanks.

作者: 猫猫头 时间: 2002-10-27 16:05

在VIP会员下载讨论里有

作者: jackco 时间: 2002-10-27 16:12

猫猫头,I can't get in the VIP area you said, what's wrong with me? could you tell me password? thanks a Lot!

作者: 猫猫头 时间: 2002-10-27 16:14

你去问ROBERT要吧，你给他发短消息，这是他管的

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