如何做這條:
已知g(3x)=9x^+6x (^=2)
求g(3)
中四數(函數),如何做?
2007-09-26 1:53 am
回答 (1)
2007-09-26 2:14 am
✔ 最佳答案
g(3x) = 9x^2 + 6xg(3x) = (3x)^2 + 2(3x)
g(y) = y^2 + 2y (for y=3x)
so, g(3) = 3^2 +2(3)
= 9 + 6 = 15
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070925000051KK02276