b3+5b2阴气重的人如何化解解

对于0<b<a,有关系a2-6b2=-ab,则化简a3?b33ab2÷a2+ab?2b22b2+3ab+a2等于(  )A.3.5B.a+bC.a+2b_百度知道
提问者采纳
∵a2-6b2=-ab,可以变形为a2-6b2+ab=0,即(a-2b)(a+3b)=0,又∵0<b<a,则a+3b>0,∴a-2b=0,∴a=2b,把a=2b代入3?b33ab2÷a2+ab?2b22b2+3ab+a2,=3?b36b3?2+6b2+4b24b2+2b2?2b2,=36b3?12b24b2,=,=3.5.故选A.
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3秒自动关闭窗口试用了 DevExpress.v11.2 版的 Silverlight 控件库,很多控件是项目中需要的,我个人不喜欢制造已有的好轮子(浪费时间),有强大的第三方库用之!
强烈鄙视那些用工具反编译后,将源码复制到新项目中,重新整理改改命名空间、改改类名最后编译,瞪着眼睛愣说是自己写的代码,我X,够不要脸的!
试用版到期后,在使用时会弹出下面的对话框,那我们的目的就是怎么不让它弹出。
通过工具分析了下&DevExpress.Xpf.Core.v11.2.dll &,找到几处关键代码。
private static bool Verify(out bool isExpired)
isExpired = false;       // 这里关键
if (Application.Current.Resources.Contains("DevExpress.Xpf.License"))
string hashValue = Application.Current.Resources["DevExpress.Xpf.License"] as string;
if (hashValue != null)
{            // 这里是关键
if (CheckHash(hashValue, "Full", 0xff))
return true;
DateTime today = DateTime.T
isExpired = true;
for (int i = 0; i & 50; i++)
string checkString = today.AddDays((double) i).ToString("d", CultureInfo.InvariantCulture);
if (CheckHash(hashValue, checkString, 10))
isExpired = false;
return false;
return true;
private static bool CheckHash(string hashValue, string checkString, int depth)
for (int i = 0; i &= i++)
string s = checkString + i.ToString();
Encoding.Unicode.GetEncoder();
byte[] bytes = Encoding.UTF8.GetBytes(s);
SHA1 sha = new SHA1Managed();        
//这里是关键
if (BitConverter.puteHash(bytes)) == hashValue)
return true;
return false;
现在我们知道了它是怎么验证的,直接列出生成的255个许可字符串吧。(现只针对 v11.2 版,其他版本的Devexpress for Silverlight 库是怎样的我没看,不保证相同。)
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一、打开 Silverlight 项目 App.xaml 文件,选一个许可字符串添加到 "DevExpress.Xpf.License" &中,就可正常使用了,不再弹出对话框。
当我们通过设计器向界面中添加Silverlight控件时,它会再次添加一个 DevExpress.Xpf.License 覆盖我们添加的许可串 ,我们不用理会,最后发布时再修改为可用的许可字符串即可,也可以直接删掉DevExpress.Xpf.License。
&Application xmlns="/winfx/2006/xaml/presentation"
xmlns:x="/winfx/2006/xaml"
x:Class="DevExpressTest.App"
      
xmlns:my="clr-namespace:Sassembly=mscorlib"&
&Application.Resources&
&my:String x:Key="DevExpress.Xpf.License"&97-A4-83-D7-EA-30-0A-48-64-02-D1-22-B4-99-04-35-A2-C5-94-50&/my:String&
&/Application.Resources&
&/Application&
二、除了上面的方法,还有一个最简单的方法
编辑 App.xaml.cs 文件,添加一行代码删除&"DevExpress.Xpf.License"&
public App()
this.Startup += this.Application_S
this.Exit += this.Application_E
this.UnhandledException += this.Application_UnhandledE
InitializeComponent();
Application.Current.Resources.Remove("DevExpress.Xpf.License");
Silverlight 控件使用手册
阅读(...) 评论()设数列{an}是公差不为0的等差数列,Sn为其前n项和,数列{bn}为等比数列,且a1=b1=2,S2=5b2,S4=25b3.(_百度知道
设数列{an}是公差不为0的等差数列,Sn为其前n项和,数列{bn}为等比数列,且a1=b1=2,S2=5b2,S4=25b3.(
设数列{an}是公差不为0的等差数列,Sn为其前n项和,数列{bn}为等比数列,且a1=b1=2,S2=5b2,S4=25b3.(I)求数列{an}和{bn}的通项公式an及bn;(II)设数列{cn}满足cn=bnSn,问当n为何值时,cn取得最大值?
提问者采纳
(I)设等差数列{an}的公差为d,等比数列{bn}的公比为q,则S2=2a1+d=4+d,S4=4a1+6d=8+6d,b2=b1q=2q,b3=2q2,根据题意可得:S2=5b2,S4=25b3,即2,解得:或者(舍去),因为a1=b1=2,数列{an}是等差数列,数列{bn}为等比数列,所以an=4n-2,bn=n?1.(II)因为Sn是等差数列{an}的前n项和,所以Sn=2n2,所以cn=bnSn=4n2n?1.假设Cn最大,因为C1=4,C2=,所以C1<C2,所以n≥2.由Cn最大,可得:n≥Cn+1Cn≥Cn?1,即2(45)n?1≥4(n+1)2(45)n4n2(45)n?1≥4(n?1)2(45)n?2,化简可得:2?8n?4≥0n2?10n+5≤0,解得:,因为45,所以8<n<10,所以n=9,即当n=9时,C9最大.
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