1.if x^2=y^3
then,x:y=?
2.if 8^x=2^y
then,x:y=?
steps.
ratio
2010-02-07 2:13 am
回答 (2)
2010-02-07 2:59 am
✔ 最佳答案
1. x^2 = y^3x = y^(3/2)
So, x : y
= y^(3/2) : y
= y^(1/2) : 1
2. 8^x = 2^y
log(8^x) = log(2^y)
xlog8 = ylog2
xlog(2^3) = ylog2
3xlog2 = ylog2
3x = y
x : y = 1 : 3
參考: Physics king
2010-02-07 2:59 am
1. Wrong Question
2. 8^x=2^y
both side take log , we have xlog8=ylog2
and xlog(2^3)=ylog2
=>3xlog2=ylog2
=3x=y
=>x/y=1/3
=>x:y=1:3//
2. 8^x=2^y
both side take log , we have xlog8=ylog2
and xlog(2^3)=ylog2
=>3xlog2=ylog2
=3x=y
=>x/y=1/3
=>x:y=1:3//
收錄日期: 2021-04-19 21:18:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100206000051KK01111