3a^2n-5a^n=2
甘n等於？
問 M1的初學問題
2010-09-12 5:04 am
回答 (1)
2010-09-12 6:06 pm
✔ 最佳答案
3a^2n - 5a^n = 23(a^n)^2 - 5a^n - 2 = 0(3a^n + 1)(a^n - 2) = 0a^n = - 1/3 (rejected) or a^n = 2 ,log (a^n) = log 2n log a = log 2n = (log 2) / log an = log a 2
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https://hk.answers.yahoo.com/question/index?qid=20100911000051KK01637