如图,在等边三角形
中,
于点
以
为一边向右作等边三角形
与
交于点
试判断
与
的数量关系,井给出证明.
![](https://img.xkw.com/dksih/QBM/2020/3/30/2430688963862528/2431582888263680/STEM/fd08e986-de30-4879-9333-cc62e349bde2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3ad66cf49d46fe39be15f5c23eec68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e242d43b6d059f57efe4301c2d2dc6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2020/3/30/2430688963862528/2431582888263680/STEM/fd08e986-de30-4879-9333-cc62e349bde2.png)
更新时间:2020-03-31 20:50:57
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适中
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【推荐1】如图,∠BAD=∠CAE=90°,AB=AD,AE=AC,AF⊥CB,垂足为F.
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760266856235008/2817120391487488/STEM/b21179cbee26437bbc52cad98dd60434.png?resizew=326)
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![](https://img.xkw.com/dksih/QBM/2021/7/9/2760266856235008/2817120391487488/STEM/b21179cbee26437bbc52cad98dd60434.png?resizew=326)
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解答题-证明题
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【推荐2】在小学,我们已经初步了解到,正方形的每个角都是90°,每条边都相等.如图,在正方形ABCD外侧作直线AQ,且∠QAD=30°,点D关于直线AQ的对称点为E,连接DE、BE,DE交AQ于点G,BE交AQ于点F.
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![](https://img.xkw.com/dksih/QBM/2020/10/13/2570198185009152/2570707595911169/STEM/9d63bbc12c114e92948c55dd673a65ba.png?resizew=207)
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【推荐1】如图,AB是⊙O的直径,C、D是⊙O上的点,∠CDB=30°,过点C作⊙O的切线交AB的延长线于点E.
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【推荐2】如图,在
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于F,延长
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10404d9512f80192cfc21ebe8a936e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dda6a3bb409caff49534f13a6993ada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810f9b4c1535bf75de1e31c164ccfe1e.png)
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