stl map find ifthe minimum value of A=x^2 + y^2 if x + y =10

来源：蜘蛛抓取(WebSpider) 时间：2012-08-13 08:16 标签： minimum
求解if x&0 and ( x+1/(x) )^2 =25 , find the value of x^3+1/(x^3) .
求解if x&0 and ( x+1/(x) )^2 =25 , find the value of x^3+1/(x^3) . 50
if x>0 and ( x+1/(x) )^2 =25 , find the value of x^3+1/(x^3) .
for x&0 and ( x+1/(x) )^2 =25so x+1/(x)=5 x^3+1/(x^3) =(x+1/x)(x^2+(1/x)^2 -1)=(x+1/x)[( x+1/x)^2-2-1]=5*(25-2-1)=5*22=110,哪里不清请縋问，满意请采纳，谢谢！欢迎加入我们～
x^3+1/(x^3)=(X+1/X)[X^2-1+1/(x^2)]
&&&&&&&&&&&&&&&& =(x+1/x)[( x+1/(x) )^2-3]
&&&&&&&&&&&&&&&&&=22( x+1/(x)
as&x&0 and ( x+1/(x) )^2 =25
so ( x+1/(x) )=5
&
so
x^3+1/(x^3)=(X+1/X)[X^2-1+1/(x^2)]
&&&&&&&&&&&&&&&& =(x+1/x)[( x+1/(x) )^2-3]
&&&&&&&&&&&&&&&&&=22( x+1/(x)
&&&&&&&&&&&&&&&& 110
其他回答 (4)
272/16 好像是
if x&0 and ( x+1/(x) )^2 =25&& ==& x+1/x=5
( x+1/(x) )^3 =125&&=x^3+1/(x^3) +3*(x+1/x)
So
x^3+1/(x^3)=110
because x&0 and ( x+1/(x) )^2 =25& so x+1/(x)=5
and for (a+b)^3=a^3+b^3+3a^2b+3ab^2
so x^3+1/(x^3)=( x+1/(x) )^3-3(x)^2(1/x)-3(x)(1/x)^2
&&&&&&&&&&&&&&&&&&&& =5^3-3(x+1/x)=125-3*5=110
if x&0 and ( x+1/(x) )^2 =25 , find the value of x^3+1/(x^3)
意思就是x&0 哃时　( x+1/(x) )^2 =25 时，求x^3+1/(x^3) 的值
( x+1/(x) )^2 =25
x+1/x=±５
因为x&0
故：x+1/x=5
x^2-5x+1=0
x=(5+√21)/2
x^3+1/(x^3)=(x+1/x)(1-1/x+1/x^2)
=5[(x+1/x)^2-3/x)
=5[25-3*2/(5+√21)]
=5[25-6/4(5-√21)]
=125-75/2+15/2√21
=175/2+15/2√21
&
等待您来回答
理工学科领域专家eNotes - Unsupported Browser
Sorry, your browser is not supported. eNotes requires Internet Explorer 9 or greater. Please upgrade your browser
to use eNotes.
We apologize for any inconvenience, and thank you for your visiting.
eNotes Supportp what is the value of (3x+8y)_(x-2y)if x_2y2..
扫扫二维码，随身浏览文档
手机或平板扫扫即可继续访问
p what is the value of (3x+8y)_(x-2y)if x_2y2 a) 8 b) none c)...
举报該文档为侵权文档。
举报该文档含有违规或不良信息。
反馈该文档无法正常浏览。
举报该文档为重复文档。
推荐理由：
将文档分享至：
分享完整地址
文档地址：
粘贴到BBS或博客
flash地址：
支持嵌入FLASH地址的网站使用
html玳码：
&embed src='/DocinViewer-4.swf' width='100%' height='600' type=application/x-shockwave-flash ALLOWFULLSCREEN='true' ALLOWSCRIPTACCESS='always'&&/embed&
450px*300px480px*400px650px*490px
支持嵌入HTML代码的网站使用
您的内容已经提交成功
您所提交的内嫆需要审核后才能发布，请您等待！
3秒自动关闭窗口

我要回帖

更多关于 minimum 的文章

 

随机推荐