如图,BD为平行四边形ABCD的对角线,按要求完成下列各题.
(1)用直尺和圆规作出对角线BD的垂直平分线交AD于点E,交BC于点F,垂足为O,连接BE和DF,
保留作图痕迹;不要求写作法![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)在(1)的基础上,求证:
.
(1)用直尺和圆规作出对角线BD的垂直平分线交AD于点E,交BC于点F,垂足为O,连接BE和DF,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)在(1)的基础上,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db614b42dd6f5e38f821b6c83e752e8c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/5958315d-676e-4262-a985-f3650fd12a0a.png?resizew=195)
更新时间:2019-04-19 21:19:30
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解答题-证明题
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【推荐1】如图,点D在AC上,点E在AB上,AB=AC,∠B=∠C.求证:
![](https://img.xkw.com/dksih/QBM/2016/3/14/1573985731411968/1573985736908800/STEM/7a420da7776647e9992927ab64ae4bd6.png)
(1)△ABD≌△ACE;
(2)BE=CD.
![](https://img.xkw.com/dksih/QBM/2016/3/14/1573985731411968/1573985736908800/STEM/7a420da7776647e9992927ab64ae4bd6.png)
(1)△ABD≌△ACE;
(2)BE=CD.
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解答题-问答题
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【推荐2】如图,在等边
中,
分别是
上的点,且
与
相交于点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc022ef2c18839fe3cdbce307f9ecc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137e995fefdbc9b555e40b54e3a118c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c2abaa85617b21716b855ada4d03bd8.png)
![](https://img.xkw.com/dksih/QBM/2019/7/2/2238234090217472/2238381307297792/STEM/3396ec0b2fb346759bc551ff90b62e3b.png?resizew=158)
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解答题-作图题
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【推荐1】如图,
中,
,点
是
中点,连接
,过点
作
.
作直线
于点
(基本作图,保留作图痕迹不写作法,并标明字母);
(2)求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/2099666bc1f575f9d1b1476867bcaa52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab1578665918e9bc35fbefc92feb90c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
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解答题-作图题
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【推荐2】如图,
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3582fb22962d70a3fa88e259e9736892.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/e67621e4-7f04-4c6c-8ca2-c28309bd445b.png?resizew=136)
(1)求作边
的垂直平分线,交
于点D;(要求:尺规作图,不写作法,保留作图痕迹);
(2)若
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3582fb22962d70a3fa88e259e9736892.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/e67621e4-7f04-4c6c-8ca2-c28309bd445b.png?resizew=136)
(1)求作边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78002bca853929365a3f58082f3e7637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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解答题-证明题
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(0.65)
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【推荐1】如图,平行四边形
中,
与
相交于点O,点P为
中点,
交
于点E,连接
,
.
(1)求证:平行四边形
为菱形;
(2)若
,
,
①求
的值.
②求
的长.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/31/f3f95928-b727-4997-80b2-220c4787efd6.png?resizew=178)
(1)求证:平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb30af9824937fdd6b1165308f3521b.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】在中,
分别是
的中点.
(1)如图1,求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bdae3d30abf70515bdbd45f9d0c380.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbe3114e3904346f34ffa843cbb3146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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