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急 ! F4 數 Function 4
2011-12-06 8:58 pm
回答 (1)
2011-12-06 9:08 pm
✔ 最佳答案
a.f(1+x) = f(1) x f(x)
put x = 0
f(1+0) = f(1) x f(0)
f(1) = f(1) x f(0)
f(0) = 1
b.
f(1+x) = f(1) x f(x)
put x = -1
f(1-1) = f(1) x f(-1)
f(0) = f(1) x f(-1)
from a. we have f(0) = 1
thus, 1/f(1) = f(-1)
收錄日期: 2021-04-13 18:23:16
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111206000051KK00358