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如图，在四边形ABCD中，点E，F，G，H分别是AB，CD，AC，BD的中点，若AD＝BC＝2，则四边形EGFH的周长是 ．
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空间四边形ABCD中若AB＝BC＝CD＝DA＝AC＝BCE.F.G.H.分别是AB.BC.CD.DA
平行四边形
长方形
菱形
正方形
如图在四边形ABCD中点E.F.分别是ADBC的中点G.H.分别是BDAC的中点.1求证四边形EGF
已知如图在四边形ABCD中EFGH分别是ABBCCDDA的中点.求证:四边形EFGH是平行四边形.
在四边形ABCD中点EFGH分别是边ABBCCDDA的中点如果四边形EFGH为菱形那么四边形ABC
如图四边形ABCD中E.F.G.H.分别是ABBDCDAC的中点.1判断四边形EFGH是何种特殊的四
如图四边形ABCD中E.F.G.H.分别是边ABBCCDDA的中点.请你添加一个条件使四边形EFGH
如图在四边形ABCD中AB=CDE.F.分别是ADBC的中点G.H.分别是对角线BDAC的中点.1求
我们给出如下定义顺次连接任意一个四边形各边中点所得的四边形叫中点四边形.1如图1四边形ABCD中点E
我们给出如下定义顺次连接任意一个四边形各边中点所得的四边形叫中点四边形.1如图1四边形ABCD中点E
如图所示在四边形ABCD中E.F.G.H.分别是ABBCCDDA的中点请添加一个与四边形ABCD对角
我们给出如下定义顺次连接任意一个四边形各边中点所得的四边形叫中点四边形.1如图1四边形ABCD中点E
如图已知EFGH分别是▱ABCD的边ABBCCDDA上的点且AE=CGBF=DH.求证四边形EFGH
如图四边形ABCD中E.F.G.H.分别是ABBDCDAC的中点.1判断四边形EFGH是何种特殊的四
已知如图四边形ABCD中E.F.G.H.分别是ABBCCDDA的中点.求证四边形EFGH是平行四边形
如图在四边形ABCD中AC=BD且AC⊥BDE.F.G.H.分别是ABBCCDDA的中点.则四边形E
如图在四边形ABCD中对角线ACBD相交于点O.且AC⊥BD点E.F.G.H.分别是ABBCCDDA
如图在四边形ABCD中E.F.G.H.分别是AB.BD.CD.AC的中点要使四边形EFGH是菱形则四
四边形ABCD是梯形
四边形ABCD是菱形
对角线AC＝BD
AD＝BC
已知点E.F.G.H.分别是四边形ABCD的边ABBCCDDA的中点若AC⊥BD且AC≠BD则四边形
我们给出如下定义顺次连接任意一个四边形各边中点所得的四边形叫中点四边形.1如图1四边形ABCD中点E
在四边形中点E.F.G.H.分别是边ABBCCDDA的中点如果四边形EFGH为菱形那么四边形ABCD
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如图在平面直角坐标系中△ABC△A1B1C1△A2B2C2△A3B3C3…△AnBn∁n都是等腰直角三角形点BB1B2B3…Bn都在x轴上点B1与原点重合点AC1C2C3…∁n都在直线ly＝x+上点C在y轴上AB∥A1B1∥A2B2∥…∥AnBn∥y轴AC∥A1C1∥A2C2∥…∥An∁n∥x轴若点A的横坐标为﹣1则点∁n的纵坐标是．
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10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.错误涉及一个单词的增加删除或修政 增加:在缺词处加一个漏字符号∧并在下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下写出修改后的词. 注意:1.每处错误及其修改均仅限一词 2.只允许修改10处多者从笫11处起不计分. Lifeisanmysteryandwewillneverknowthatwhatiswaitingforus.Butonethingisforsure:problemsareunavoidable.Forusit'stheprocessofsolvingproblemsthathelpusgrow. Makeaspeechusedtobeabigproblemforme.WithastrongaccentandterriblypronunciationIfailedinspeechcompetitionmanytimesbutldidn'tholdback.InthecontraryIconsidereditagoodchanceformetoimprovemyself.Irecordedmyspeechlisteningtoitandcorrectedmypronunciation.NowI'mconfidentenoughtogivemybestspeechtoyoua11. Mydearfriendsdon'tafraidofproblemsbuttakeadvantageofittobethebestofourselves!
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