數學與生活4a~
P5.45....第10/11題!
10)4㏒x＋㏒x^5－3㏒x^3
=???
11)3㏒x-5㏒√x
_______________
2㏒x^1/2
=???
是但做1題都OK~
最好2題做曬LA~
謝謝....
數2題..勁人進入...忽4a
2009-12-12 4:23 am
回答 (3)
2009-12-12 4:32 am
✔ 最佳答案
(1) 4㏒x＋㏒x^5－3㏒x^3= 4㏒x+5㏒x-3(3)㏒x
=4㏒x+5㏒x-9㏒x
=0
(2) 3㏒x-5㏒√x
????what's that?
(3) 2㏒x^1/2
= 2(1/2)㏒x
=㏒x
參考: me
2009-12-12 5:24 pm
10)4㏒x＋㏒x^5－3㏒x^3
=4logx+5logx-9logx
=0
11)3㏒x-5㏒√x
_______________
2㏒x^1/2
=(3logx-5log(x^(1/2))/(2logx^1/2)
=(3logx-(5/2)logx)/(logx)
=((1/2)logx)/logx
=1/2
=4logx+5logx-9logx
=0
11)3㏒x-5㏒√x
_______________
2㏒x^1/2
=(3logx-5log(x^(1/2))/(2logx^1/2)
=(3logx-(5/2)logx)/(logx)
=((1/2)logx)/logx
=1/2
2009-12-12 4:50 am
10)4㏒x＋㏒x^5－3㏒x^3
= logx^4 + logx^5 - logx^9
=log(x^4)(x^5) - logx^9
=log[x^9/x^9]
=log1
=0
= logx^4 + logx^5 - logx^9
=log(x^4)(x^5) - logx^9
=log[x^9/x^9]
=log1
=0
收錄日期: 2021-04-13 16:58:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091211000051KK01332