solve 2(3^(2X-3))=5^x 求助 謝謝?
回答 (3)
2016-10-05 8:39 am
✔ 最佳答案
都logLog2+(2x-3)log3=xlog5
0.3010+0.4771(2x-3)=0.699x
X大約4.429
2016-10-09 3:01 am
2(3^(2X-3))=5^x
log 2 +(x-3)log 3=x log 5
log 2 +2x log 3-3 log 3=x log 5
log 2 -3log 3=x(log 5 -log 9)
x=[log(5/9)]/[log(2/27)]
log 2 +(x-3)log 3=x log 5
log 2 +2x log 3-3 log 3=x log 5
log 2 -3log 3=x(log 5 -log 9)
x=[log(5/9)]/[log(2/27)]
2016-10-05 2:58 pm
七分之八
收錄日期: 2021-04-18 15:46:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20161005002657AAXG6nh