logarithm
回答 (2)
2012-07-07 6:04 am
✔ 最佳答案
= log₃81 + log₅625 - log₇343= log₃3⁴ + log₅5⁴ - log₇7³= 4 + 4 - 3= 5 I HOPE THIS CAN HELP YOU! ^_^
參考: My Maths World
2012-07-08 8:40 am
log_(3) 81 + log_(5) 625 - log_(7) 343
=log_(3)(3^4)+log_(5)(5^4)-log_(7)(7^3)
=4+4-3
=5
=log_(3)(3^4)+log_(5)(5^4)-log_(7)(7^3)
=4+4-3
=5
收錄日期: 2021-04-13 18:48:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120706000051KK00682