如图,将△ABC绕点B顺时针旋转60°得△DBE,点C的对应点E给好落在AB的延长线上,连接AD,下列结论不一定正确的是( )
![](https://img.xkw.com/dksih/QBM/2018/12/17/2098868141916160/2100963118170112/STEM/d81084ec9c0d4128861dabdfc953c7be.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2018/12/17/2098868141916160/2100963118170112/STEM/d81084ec9c0d4128861dabdfc953c7be.png?resizew=180)
A.AD∥BC | B.∠DAC=∠E | C.BC⊥DE | D.AD+BC=AE |
更新时间:2018-12-20 18:03:19
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【推荐1】如图所示,点E是AD延长线上一点,如果添加一个条件,使BC∥AD,则可添加的条件为( )
![](https://img.xkw.com/dksih/QBM/2020/1/28/2393765704056832/2396744279433217/STEM/215b40728a374ff0bdbe09b91d054205.png?resizew=195)
![](https://img.xkw.com/dksih/QBM/2020/1/28/2393765704056832/2396744279433217/STEM/215b40728a374ff0bdbe09b91d054205.png?resizew=195)
A.∠C+∠ADC=180° | B.∠A+∠ABD=180° |
C.∠CBD=∠ADC | D.∠C=∠CDA |
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【推荐2】已知下列命题:
①若
,则
;
②如果两个角是直角,那么它们相等;
③同位角相等,两直线平行;
④如果两个实数相等,那么它们的平方相等.
其中逆命题为真命题的个数是( )
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5f421939ee855f25927e7570d82c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653a7d2cba5c557c6fec515533a73999.png)
②如果两个角是直角,那么它们相等;
③同位角相等,两直线平行;
④如果两个实数相等,那么它们的平方相等.
其中逆命题为真命题的个数是( )
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,在等边
中,
是
边上的两点,
,点
分别是线段
上的一动点,连接
与
交于点
,若四边形
是平行四边形,则点
由点
移动到点
的过程中,下列结论正确的是( )
①
;②
;③当
运动到
中点时,四边形
是菱形,且菱形面积为
;④点
由点
移动到点
的过程中,点
所走的路径长为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/7441230d-bb79-4927-9a10-23b1a65fad32.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d741cd3b19c54028e1d200c209e9baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9cc1bccdf87e40fdaaddbb9cd18abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9369aed2d8309af46ac3eaffb9cce537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8ad3423ca03e912557f9ab4f733456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4531cdc420350a676f73cf9139fcbe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92e6f84f2a5721303019f158d860cd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01bf28629180113c8f27b9168ee7a34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631ff7d27523923a08f74916f85d4e6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92e6f84f2a5721303019f158d860cd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9bb52bec7f09eaf568dca3b4a4fc717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/7441230d-bb79-4927-9a10-23b1a65fad32.png?resizew=150)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,直线
与反比例函数
的图像交于A,B两点,则下列结论错误的是( )
![](https://img.xkw.com/dksih/QBM/2021/12/16/2873955869564928/2876025450987520/STEM/d66465dc-1b7b-4c03-add1-9c26463d08ff.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4983fabd2d706fca67786e581052df1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9212e728b36c078188606c9d429389d6.png)
![](https://img.xkw.com/dksih/QBM/2021/12/16/2873955869564928/2876025450987520/STEM/d66465dc-1b7b-4c03-add1-9c26463d08ff.png?resizew=166)
A.![]() | B.当A,B两点重合时,![]() |
C.当![]() ![]() | D.不存在这样的k使得![]() |
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【推荐1】如图,在△ABC中,AB=AC,∠B=30°,点D、E分别为AB、AC上的点,且DE∥BC.将△ADE绕点A逆时针旋转至点B、A、E在同一条直线上,连接BD、EC.下列结论:①△ADE的旋转角为120°;②BD=EC;③BE=AD+AC;④DE⊥AC,其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/c289ed03-28a4-4742-a4ce-c20f56e073ed.png?resizew=617)
A.②③ | B.②③④ | C.①②③ | D.①②③④ |
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【推荐2】如图,在
中,
,D,E是斜边
上两点,且
,将
绕点A顺时针旋转
后,得到
,连接
.则下列结论不正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/0bc8a400-859f-4421-ba1c-53994230d806.png?resizew=228)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76805974fefbe166b90d260e822ab5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4139b091e9dc432b267ff68420c77de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/0bc8a400-859f-4421-ba1c-53994230d806.png?resizew=228)
A.![]() | B.![]() |
C.![]() ![]() | D.![]() |
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