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急 ! Logarithmic Function C3
2011-12-12 5:33 pm
回答 (1)
2011-12-12 6:08 pm
✔ 最佳答案
11) 2 log9 x - 1 = 0log9 x = 1/2
x = 91/2 = 3
12) log2 (2x + 3) = 0
2x + 3 = 1
x = -3/2
13) log (x - 1) = 4 log 3
log (x - 1) = log 34 = log 81
x - 1 = 81
x = 82
14) log5 x - (1/3)log5 8 = 0
log5 x - log5 81/3 = 0
log5 x - log5 2 = 0
x = 2
參考: 原創答案
收錄日期: 2021-04-13 18:24:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111212000051KK00097