3^x = 9
我知x = 3
但係點列式??
9^-x = 1/27
find x.
Let a 唔等於0. solve for x
a^(x-5) = a^4
a^(3x) = a^9
最緊要列式, d式點寫我全部唔記得左!!
收錄日期: 2021-05-01 15:44:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080823000051KK00532