老师在黑板上画出如图所示的图形(其中点
在同一直线上),并给出四个条件:
,要求同学们从中选出三个作为已知,另一个作为结论来构造一道证明题.甲、乙、丙、丁四位同学的答案如下,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/f395c62d-f02d-4812-9106-b0539cc5ca42.png?resizew=165)
甲:
;乙:
;丙:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69dd05cb9a683f21665b1993265f942f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf53e2eca0f73bafd35796e64c10d0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4730bc7a56fbf201ce669cd5d483638d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/f395c62d-f02d-4812-9106-b0539cc5ca42.png?resizew=165)
甲:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/138efd5de1e70cf57fb9b06e5ceaf24d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4157f4f7be33f6d7a442295ce2019ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69dd05cb9a683f21665b1993265f942f.png)
A.三人都正确 | B.只有乙不正确 | C.只有丙不正确 | D.乙、丙都不正确 |
更新时间:2022-12-21 21:45:42
|
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【推荐2】下列命题中,逆命题为真命题的有( )
①有两边相等的三角形是等腰三角形;
②对顶角相等;
③三边对应相等的两个三角形全等;
④若
,则
.
①有两边相等的三角形是等腰三角形;
②对顶角相等;
③三边对应相等的两个三角形全等;
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176f738b91a19f8b6abff4bcc384047f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f062630a305ab6915efd03045c24fe2c.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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