12(9^x)=4^(x-1)
Ans: -4.77
Plz show me the steps ~
F.4 maths Logarithms?
2016-11-22 10:07 am
回答 (1)
2016-11-22 10:27 am
✔ 最佳答案
Sol12(9^x)=4^(x－1)
log12+xlog9=(x－1)log4
2log2+log3+2xlog3=2xlog2－2log2
2x(log3－log2)=-4log2－log3
x=-(4log2+log3)/[2(log3－log2)]
=－(4*0.3010+0.4771)/[2*(0.4771－0.3010)]
=－4.7731
收錄日期: 2021-04-30 22:01:39
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20161122020703AA4svZF