如果 g(x)=1/(x-4)
求g(1/x)
答案是 1/(1-4x)
請列出詳細步驟...
中四的數學問題
2008-01-23 10:16 pm
回答 (2)
2008-01-23 10:27 pm
✔ 最佳答案
G(1÷X)=1÷(1/X - 4)= 1÷(1/X- 4x/x)
=1÷(1-4X/X)
= X/(1-4X)
希望你明日^^
2008-01-23 10:44 pm
put x = 1/x
Then g(1/x) = 1 / [(1/x) - 4]
= 1 / [(1/x) - 4x/x]
= 1 / [(1-4x) / x]
= x / (1-4x)
Then g(1/x) = 1 / [(1/x) - 4]
= 1 / [(1/x) - 4x/x]
= 1 / [(1-4x) / x]
= x / (1-4x)
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080123000051KK01307