Solve the equation
logarithm of the number X to the base 3 + logarithm of 9 to the base x =3
Help me please(Maths)
2010-10-11 11:59 pm
回答 (1)
2010-10-12 12:28 am
✔ 最佳答案
log(base 3) x + log(base x) 9 = 3(log x) / log 3 + (log 9) / log x = 3(log x)(log x) + (log 9)(log 3) = 3(log 3)(log x)(log x)^2 - (3log3)(log x) + 2(log 3)^2 = 0( log x - log3) (log x - 2log3) = 0log x = log 3 or log x = 2log3 = log9x = 3 or x = 9
收錄日期: 2021-04-21 22:17:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101011000051KK00623