更新1:
2) log3(4x - 1) = 3 P.S log3 個３係base
有數唔識(maths)
回答 (2)
2008-01-30 9:52 am
✔ 最佳答案
1. 4^2=6^3x-116=6^3x-1
log6 16 = 3x-1
3x= log6 16 +1
x= (log6 16 +1)/3
2. log3 (4x-1) = 3
3^3 = 4x-1
27= 4x-1
28= 4x
x = 7
2008-01-30 6:12 am
1) 4²=6^3x -1
17=6^3x
log17=3xlog6
x=log17/3log6
≈0.527
2)log₃(4x - 1) = 3
4x-1=27
4x=28
x=7
17=6^3x
log17=3xlog6
x=log17/3log6
≈0.527
2)log₃(4x - 1) = 3
4x-1=27
4x=28
x=7
收錄日期: 2021-04-23 20:33:09
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080129000051KK03251