標題:
[Core]
請教
[打印本頁]
作者:
ADMIRE_MOON
時間:
2016-4-21 10:18 PM
標題:
請教
32同33點做?Thanks a lot
作者:
marcoc
時間:
2016-4-21 10:29 PM
32(a)
Let y=-10^(x-1)
-9y=9
y=-1
-10^(x-1)=-1
x-1=0
x=1
作者:
marcoc
時間:
2016-4-21 10:32 PM
32(b)
log(10^(x-1)+9)=x
10^(x-1)+9=10^x
10^x-10^(x-1)=9
x=1 (from (a))
作者:
marcoc
時間:
2016-4-21 10:33 PM
33(a)
2^(x+2)-2^x
=2^x*2^2-2^x
=2^x*3
作者:
marcoc
時間:
2016-4-21 10:35 PM
33(b)
equation is equal to
2^x+12=2^(x+2)
2^(x+2)-2^x=12
2^x*3=12 (from (a))
2^x=2^2
x=2
歡迎光臨 小卒資訊論壇 (http://lsforum.net/board/)
Powered by Discuz! 6.0.0