如图,已知AC⊥BC,∠DAB=70°,AC平分∠DAB,∠DCA=35°.
![](https://img.xkw.com/dksih/QBM/2019/6/28/2235353886638080/2238005490384896/STEM/9f2ab04f649547a0857fac60750ffb0c.png?resizew=170)
(1)直线AB与DC平行吗?请说明理由.
(2)求∠B的度数.
![](https://img.xkw.com/dksih/QBM/2019/6/28/2235353886638080/2238005490384896/STEM/9f2ab04f649547a0857fac60750ffb0c.png?resizew=170)
(1)直线AB与DC平行吗?请说明理由.
(2)求∠B的度数.
更新时间:2018-05-08 23:22:09
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【推荐1】如图所示,已知AB
CD,C在D的右侧,BE平分∠ABC,DE平分∠ADC,BE,DE所在直线交于点E,∠ADC=70°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/2/1f90b5d4-1ade-4558-b6cb-2b48f7c00ed2.png?resizew=293)
(1)求∠EDC的度数;
(2)若∠ABC=n°,求∠BED的度数(用含n的式子表示);
(3)将线段BC沿DC方向平移,使得点B在点A的右侧,其他条件不变,若∠ABC=n°,求∠BED的度数(用含n的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/2/1f90b5d4-1ade-4558-b6cb-2b48f7c00ed2.png?resizew=293)
(1)求∠EDC的度数;
(2)若∠ABC=n°,求∠BED的度数(用含n的式子表示);
(3)将线段BC沿DC方向平移,使得点B在点A的右侧,其他条件不变,若∠ABC=n°,求∠BED的度数(用含n的式子表示).
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【推荐2】如图,在
中,
,
是
的平分线,
是
边上的高,垂足为
,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/3e1c74d3-a341-4018-a21c-92823e411344.png?resizew=307)
(1)探究与发现
①如图
,若
,则
的度数为______,
的度数为______;
②如图
,若
,则
的度数为______;
③试探究
与
的数量关系,并说明理由.
(2)拓展与思考:如图
,
的平分线
交
于点
当
时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727658b00efa0920188efb4051a3c92c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/3e1c74d3-a341-4018-a21c-92823e411344.png?resizew=307)
(1)探究与发现
①如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
②如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2334ac570fefa8bcb3f48ef6da9719e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
③试探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)拓展与思考:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5704eac867e33aaefd43da48b0f222f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100b3e7dcd5f34c5234971cd75bff138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
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【推荐1】如图,已知
,直线分别交
、
于点
,
,
,
.
(1)已知
,求
;
(2)求证:
平分
;
(3)若
,则
的度数为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173cea931c4988da31b3dd3ae1b47f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac3db9e03aaae5680cf0c83c3d3fc35.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/a5f783af-8e82-4570-a28b-624b78303727.png?resizew=156)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b030708f7e622f3f992649b21eec6b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecec0ac9ee10034e651df1ef4c18dbc1.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5754ed0cdc3305585f34eb0c8345fad.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d56a32698d97dd785268b7bf791bfffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7023dd9731a2ff5abb503d7a65b5646.png)
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【推荐2】如图,已知∠AMB=∠EBF,∠BCN =∠BDE,求证:∠CAF =∠AFD.
![](https://img.xkw.com/dksih/QBM/2017/10/12/1793766448398336/1794430326112256/STEM/28b6051d47a14bd49ce489bee70c30ea.png?resizew=112)
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【推荐2】如图,在等腰
中,
,过点
作
,垂足为点
.若
,
,
.
;
(2)求
的长.
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf96bd081660f8715e38ee739000a331.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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