如图,
是平行四边形
的对角线,点
在
上,
,
,则
的大小是( )
![](https://img.xkw.com/dksih/QBM/2021/6/8/2738620932030464/2740625399717888/STEM/ea2b055c-5e37-41af-822e-eaf4b8a88584.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ebc1d5f0a1c141a452c9b7a25da01c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284fdf3831cccbc03a28b687f5d0d784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/2021/6/8/2738620932030464/2740625399717888/STEM/ea2b055c-5e37-41af-822e-eaf4b8a88584.png?resizew=160)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2021-06-11 11:59:33
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【推荐1】如图所示,已知
,点
在线段
上(不与点
、点
重合),连接
,若
,
.则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81131259f548e8803da8dec25fb644c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64d5fcee996a47e9cc3cfd4ba108f21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】下列说法正确的有( ).
①由一些线段首尾顺次相接组成的图形叫做多边形;
②三角形的外角大于它的内角;
③若a≥b,则
;
④三角形的中线把三角形分成面积相等的两部分;
⑤三角形的外角至少有两个钝角;
⑥把一根长11m的钢管截成2m和3m长两种规格的钢管,一共有2种不同的截法.
①由一些线段首尾顺次相接组成的图形叫做多边形;
②三角形的外角大于它的内角;
③若a≥b,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2e1b827862789493646b5e41e73807.png)
④三角形的中线把三角形分成面积相等的两部分;
⑤三角形的外角至少有两个钝角;
⑥把一根长11m的钢管截成2m和3m长两种规格的钢管,一共有2种不同的截法.
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,在
中,
,将
绕点
逆时针旋转,得到
,点
恰好落在
的延长线上,则旋转角的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/418f23aa-f862-4471-9956-4e2a4705370b.png?resizew=173)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d777d15cd733338ecfd0ea63819f62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/418f23aa-f862-4471-9956-4e2a4705370b.png?resizew=173)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在
中,已知O为AC上一点,以
为半径的圆经过点A,且与
,
分别交于点E,D.设
,
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/e4c4ded4-7253-40a9-923e-cea90f695e2e.png?resizew=199)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/148cdaa1d55e9a3d940a4af77610cade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db6bf5012a8d3ec26ee104ee8261cc6f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/e4c4ded4-7253-40a9-923e-cea90f695e2e.png?resizew=199)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() ![]() | D.若![]() ![]() ![]() |
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【推荐1】如图,在
中,
,点
是
的中点;过点
作
交
于点
,则
的长度为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8067d513a9c4b181b7faa6a802e130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77301fa959a316f864889260c6823998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
A.7 | B.8 | C.9 | D.10 |
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【推荐2】如图,一钢架
中,
,焊上等长的钢条
来加固钢架,且
,对于下列结论,判断正确的是( )
结论Ⅰ:若
,则
;
结论Ⅱ:若这样的钢条在钢架上至多能焊上6根,那么
的取值范围是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a916127e3e2b3cb6be1814639492b98d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb49d869110f27140f5c1934143db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96af4f65bd3c907e50e693fa326c27bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ac461dcb2148f74a69166cf1893c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3396ed2d2af1236cb097ed9887e4c4e.png)
结论Ⅰ:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6057f05d45ea1548e2554af19c0a7f88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc1419fe4cc7fc0e9624ffd036f3d28.png)
结论Ⅱ:若这样的钢条在钢架上至多能焊上6根,那么
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a916127e3e2b3cb6be1814639492b98d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/7/1ede9b62-fbb5-4468-93cc-d8eb91713412.png?resizew=187)
A.Ⅰ和Ⅱ都对 | B.Ⅰ和Ⅱ都不对 | C.Ⅰ不对Ⅱ对 | D.Ⅰ对Ⅱ不对 |
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【推荐1】如图,平行四边形
的对角线
、
相交于点O,
平分
,分别交
、
于点E、P,连接
,
,
,则下列结论中,不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf9d6aebbcddbaf996cc9c50aff400de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/6856225b-7cdd-442b-962a-d9d01454896a.png?resizew=228)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】在面积为
的平行四边形ABCD中,分别过点A作直线BC的垂线AE,垂足为E,作直线CD的垂线AF,垂足为F.若AB=
,BC=
,则CE+CF的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e29c0a0ec8708992ab2a8001e62960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb7a10603ed6ab40ec1fee662af35d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbff61fe9d4e93d7cc338489d1c99c40.png)
A.![]() | B.![]() |
C.![]() ![]() | D.![]() ![]() |
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