如图,在
中,
是
的中点,作
于点
,连接
,
,则下列结论中一定成立的是___________ .(把所有正确结论的序号都填在横线上)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/af5b086b-e88c-436a-980f-8c4a0959f083.png?resizew=201)
①
;
②
;
③
;
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85f4ac20bb785b1fc9fb58a3165a5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/af5b086b-e88c-436a-980f-8c4a0959f083.png?resizew=201)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75b00d3ffe63da0ca2ff17540a7065b.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cf85915bdd25319de8f8b464bc59fd.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab618c936da03808cb9953783d42b30.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855fa6dadf7dae35534fe9eff2497a89.png)
更新时间:2023-07-11 21:54:42
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【推荐1】如图,点A、B、C在一条直线上, ∆ABD、∆BCE均为等边三角形.连结AE和CD,AE分别交CD、BD于点M、P,CD交BE点Q.连结PQ、BM.①ABE ≌DBC;②∠DMA﹦60°;③BPQ为等边三角形;④MB平分∠AMC,其中正确结论的序号是________________________ .
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【推荐2】如图,
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上,点
在边
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平分
.
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【推荐1】如图,在△ABC中,AC=BC=9,∠ACB=90°,CD=BC,过点C作CE⊥AD,垂足为点H,交DB的延长线于点E,BE=
,则BD的长为____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af2fdf1944afebb51cb6a5e6c74aadd.png)
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865447484563456/2866657278803968/STEM/4f452379-2c1c-4e92-91f6-0fbaa4f5a4ac.png?resizew=249)
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【推荐2】如图,在△ABC中,∠ABC=2∠C,小明做了如下操作:
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(Ⅱ)以A为圆心,任意长为半径画弧,交AB、AC于M、N两点,分别以M、N为圆心,以大于
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依据小明尺规作图的方法,若AB=3.3,BE=1.8,则AC的长为___________ ;
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(Ⅲ)作直线EF.
依据小明尺规作图的方法,若AB=3.3,BE=1.8,则AC的长为
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189273515065344/2196318571388928/STEM/074ed2a2778141138f28b2d65485fdea.png?resizew=141)
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【推荐1】如图,
是
的边BA延长线上一点,CE与AD相交于点
,
,
,
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______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5f441402ee632377b6bedeb060f3d9.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892977596768256/2895017408978944/STEM/bbd57f7a-4271-450e-bc21-cc34171dfa76.png?resizew=205)
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【推荐2】如图,在
中,E为
的中点,
的面积为3,则
的面积为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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【推荐1】如图,在△ABC中,CD⊥AB于点D,E是AC的中点,若AD=3,DC=4,则DE的长为__________ .
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【推荐2】如图,Rt∆ABC中,
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①
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②
;
③
;
④
;
其中正确的是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44e293d963e4c45d467b577c5e63665b.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053e92e628509598d641b18d88349001.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/972a7122a6a8df93bb4fa7bc8adc7f51.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c62558356bc466c59c40150d3c683ac.png)
其中正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/aa526c85-4300-40c4-99e5-1c3ed8a1faa0.png?resizew=176)
您最近一年使用:0次