http://tinypic.com/r/w8w9kl/8
其實我唔係好清楚了解題目的意思,所以改正唔到!可否解我知嗎?
唔識做功課73
2015-06-12 12:31 am
回答 (3)
2015-06-12 1:51 am
2015-06-12 1:03 am
haha...我竟然倒轉了,thx
2015-06-12 1:01 am
Express y in terms of x.
即是 y 是主項 (subject)。
4 log(x) + 5 = -2 log(y) - 3
4 log(x) + 8 = -2 log(y)
-2 log(x) - 4 = log(y)
y = 10^[-2 log(x) - 4]
y = 10^[-2 log(x)] 10⁻⁴
y = 10^[log(x)⁻²] 10⁻⁴
y = x⁻² 10⁻⁴
y = 1/(10000x²)
即是 y 是主項 (subject)。
4 log(x) + 5 = -2 log(y) - 3
4 log(x) + 8 = -2 log(y)
-2 log(x) - 4 = log(y)
y = 10^[-2 log(x) - 4]
y = 10^[-2 log(x)] 10⁻⁴
y = 10^[log(x)⁻²] 10⁻⁴
y = x⁻² 10⁻⁴
y = 1/(10000x²)
收錄日期: 2021-04-16 16:48:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20150611000051KK00050