当ac与bd满足什么条件时,四边形abcd中ac垂直bdefgh是菱形,写出结论并证明

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2016初中中考数学真题难题 汇编
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你可能喜欢Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. &If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection. &If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name.
Server Error in '/' Application.
Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. &If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection. &If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same. &If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection. &If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[HttpException (0x): Unable to make the session state request to the session state server. Please ensure that the ASP.NET State service is started and that the client and server ports are the same.
If the server is on a remote machine, please ensure that it accepts remote requests by checking the value of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection.
If the server is on the local machine, and if the before mentioned registry value does not exist or is set to 0, then the state server connection string must use either 'localhost' or '127.0.0.1' as the server name.]
System.Web.SessionState.OutOfProcSessionStateStore.MakeRequest(StateProtocolVerb verb, String id, StateProtocolExclusive exclusiveAccess, Int32 extraFlags, Int32 timeout, Int32 lockCookie, Byte[] buf, Int32 cb, Int32 networkTimeout, SessionNDMakeRequestResults& results) +2180324
System.Web.SessionState.OutOfProcSessionStateStore.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData item, Object lockId, Boolean newItem) +221
System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +807
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +148
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
Version Information:&Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1知识点视频
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阅读下面材料:在数学课上,老师请同学思考如下问题:如图1,我们把一个四边形ABCD的四边中点E,F,G,H依次连接起来得到的四边形EFGH是平行四边形吗?小敏在思考问题是,有如下思路:连接AC.结合小敏的思路作答(1)若只改变图1中四边形ABCD的形状(如图2),则四边形EFGH还是平行四边形吗?说明理由;参考小敏思考问题方法解决以下问题:(2)如图2,在(1)的条件下,若连接AC,BD.①当AC与BD满足什么条件时,四边形EFGH是菱形,写出结论并证明;②当AC与BD满足什么条件时,四边形EFGH是矩形,直接写出结论.【考点】;;.从图中可以看出拼成形,根据转的性质.要使图形是形,三角形就要一个直角腰直角三角形.【解答】解:旋转图形如图所示.∴点的应点B′与C合,C点的对应C′与B重,旋转后得的三角形与原三角形成菱形理:由知,边AB,C是菱形,∴A′BAB=CA′C,当△AB是等腰直角角形时,拼的形是正形.理由:设△BC0转80后得到△A′′C′,则△AC≌△A′B′C′,∵O是B的点,∴′B=AC,′C=A,以边形ABAC是正方形.【点评】本题考查变作,注旋转作图找对应点是键,在第二、三小题中则综用了菱形,正方的质.声明:本试题解析著作权属菁优网所有,未经书面同意,不得复制发布。答题:王学峰老师 难度:0.60真题:4组卷:1114
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