1. 5^x = 0.5 5^-kx = 8
find the value of k.
2.16^x ( 4^x ) - 8^x-1 = 0
f4maths
2015-04-23 2:02 am
回答 (1)
收錄日期: 2021-04-20 15:37:02
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150422000051KK00064