如图,在等腰梯形ABCD中,
,
,对角线AC,BD相交于点O,有如下四个结论:①梯形ABCD是轴对称图形;②
;③
;④
.其中正确结论的个数为( )
![](https://img.xkw.com/dksih/QBM/2019/8/30/2280006713712640/2280050974646272/STEM/98c6c45b1d4e43f095983d94718a6ad6.png?resizew=138)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06e36ec59fa93ac857e35796a4b8311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed1b0a312e0ddf54abbbade60f2ca21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ca792242f0fadba9b92dc3bdfea96e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbac7dd35016dca3f7053c3ad7a690d9.png)
![](https://img.xkw.com/dksih/QBM/2019/8/30/2280006713712640/2280050974646272/STEM/98c6c45b1d4e43f095983d94718a6ad6.png?resizew=138)
A.4个 | B.3个 | C.2个 | D.1个 |
19-20九年级上·全国·期末 查看更多[2]
更新时间:2019-08-31 21:10:47
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【推荐1】如图,在正方形
中,点E从点B出发,沿边
方向向终点C运动,
交
于点F,以
,
为邻边构造平行四边形
,连接
,则
的度数的变化情况是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8689d619c2508c9000531fc1b8f1f21c.png)
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A.一直减小 | B.一直减小后增大 |
C.一直不变 | D.先增大后减小 |
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【推荐2】如图,点
是线段
上一点,
、
是等边三角形
与
交于点
,
与
交于点
,
与
交于点
下列结论:①
;②
;③
;④
;⑤
平分
其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddb32a7a5c157fdf8aa049b2d665b4c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89a478b4e188c6a4d341839b89ee7d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59c4a4eb0723665f8231dab51c1718e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
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A.①③④ | B.①②③⑤ | C.①③⑤ | D.①②③④⑤ |
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【推荐1】如图,在四边形ABCD中,AB∥CD,∠C=90°,AB=8,AD=CD=5,点M为BC上异于B、C的一定点,点N为AB上的一动点,E、F分别为DM、MN的中点,当N从A到B的运动过程中,线段EF扫过图形的面积为 ( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/52d307ef-04a7-4042-a427-d8f509dae675.png?resizew=165)
A.4 | B.4.5 | C.5 | D.6 |
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【推荐2】梯形的对角线互相垂直,其中一条对角线长为5,梯形的高为4,则梯形的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/22c0c808-a490-4eea-b272-628bfcdd13ba.jpg?resizew=155)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/22c0c808-a490-4eea-b272-628bfcdd13ba.jpg?resizew=155)
A.5 | B.10 | C.![]() | D.![]() |
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【推荐1】如图,
是边长为6的等边三角形,D,E两点分别以
和
的速度从点A,C两点出发,沿三角形的边顺时针运动,设运动时间为t,则下列哪个t值不能使
为直角三角形( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
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A.9 | B.![]() | C.![]() | D.1 |
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【推荐2】如图,正方形ABCD的对角线BD的延长线上有一点E,且
,点G在CB延长线上,连接EG,过点E作
,交BA的延长线于点F,连接FG并延长,交DB的延长线于点H,若
,
,则下列结论:①
,②
,③
∽
,④
,其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/172f3850-a1ff-4686-9bb5-f0b60891e9e4.png?resizew=282)
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A.4 | B.3 | C.2 | D.1 |
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