题型:解答题-问答题
难度:0.85
引用次数:1289
题号:7588754
如图,CE平分∠BCD,∠1=∠2=70°,∠3=40°,AB和CD是否平行?请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/2/13/2139609836388352/2140713846341632/STEM/0ea67d32-e64f-4c51-a39e-7740ddef7549.png?resizew=231)
更新时间:2019-02-14 21:56:22
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解答题-证明题
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【推荐1】如图,
,
,
平分
交
于点E,试说明
.请完善解答过程,并在括号内填写相应的理论依据.
(已知),
( ),
(已知),
( ),
(已知),
( ),
(等式的性质),
平分
(已知),
∴
( ),
(等量代换),
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ceb270913d2db87ffabdfdb6bba29cd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d516085cb289173eca1ab02bc40751e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432aca761e9fa97d3728a8038de81e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b309f91b367f7c17eae1065882e3825.png)
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∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9eb000c46cc20303695b2e833976cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c934414640a4188f0b9e9c593a862b2f.png)
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名校
【推荐2】已知:点
为直线
上一点,过点
作射线
,
.
的度数;
(2)如图2,过点
作射线
,使
,作
的平分线
,求
的度数;
(3)如图3,在(2)的条件下,作射线
,若
与
互余,请画出图形,并求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb6a70dd29662017ca458e43b7dd777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9425d02202600fd4b0bbbc7cc5ac54f6.png)
(3)如图3,在(2)的条件下,作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd5cfc1134a08462e38256529685b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f5dc1d043a4909a40238ff5b590c77.png)
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【推荐1】如图,点A、B、C、D在一条直线上,CE与BF交于点G,∠E=∠F,CE∥DF,求证:∠A=∠1
![](https://img.xkw.com/dksih/QBM/2021/6/10/2739995810889728/2740082772852736/STEM/25711e1cc8944956a46161dade74fbc2.png?resizew=146)
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【推荐2】如图,已知AB
CD,∠C=∠B.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/7b38fc6c-7113-445d-b809-4590003f4c9e.png?resizew=207)
(1)求证:CF
BD;
(2)如果AB是∠FAD的平分线,且∠ADB=96°,求∠B的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/7b38fc6c-7113-445d-b809-4590003f4c9e.png?resizew=207)
(1)求证:CF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)如果AB是∠FAD的平分线,且∠ADB=96°,求∠B的度数.
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