如图,C为直线
上一点,
为直角,
平分
平分
平分
,各学习小组经过讨论后得到以下结论:①
与
互余;②
;③
与
互补;④
.请写出正确结论的序号__ .
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22-23七年级上·湖北武汉·期末 查看更多[14]
湖北省武汉市华一寄宿学校2022-2023学年七年级上学期期末数学试题福建省莆田市涵江区2022-2023学年七年级上学期数学期末考试卷(已下线)七年级数学期末模拟卷(福建专用,人教版七上)-学易金卷:2023-2024学年初中上学期期末模拟考试福建省南安市市区联盟校2023-2024学年七年级上学期月考数学试题湖北省武汉市光谷实验中学2023-2024学年七年级上学期月考数学试题福建省龙岩市第九中学2023-2024学年七年级上学期月考数学试题四川省眉山市东坡区东坡区苏洵初级中学2023-2024学年七年级上学期期末数学试题天津外国语大学附属外国语学校2023-2024学年七年级上学期期末数学试题 福建省厦门市明区厦门市莲花中学2023-2024学年七年级上学期期末数学试题湖北省大冶市2023-2024学年七年级上学期期末数学试题湖北省仙桃市2023-2024学年七年级上学期期末数学试题福建省厦门第六中学2023-2024学年七年级上学期期末数学试题湖北省省直辖县级行政单位2023-2024学年七年级上学期期末考试数学试题湖北省武汉市解放中学2022-2023学年七年级下学期开学考试数学试题
更新时间:2024-01-17 21:21:52
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【推荐1】如图,
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【推荐2】完成下列填空:
已知:如图,AB∥CD,∠B=120°,CA平分∠BCD.求证:∠1=30°.
![](https://img.xkw.com/dksih/QBM/2018/6/21/1971996627263488/1972914812248064/STEM/9b58c347eb4247a3a9dd32711663366b.png?resizew=166)
证明:∵AB∥CD( ),
∴∠B+∠BCD= ( ).
∵∠B= ( ),
∴∠BCD= ( ).
又∵CA平分∠BCD( ),
∴∠2= ( ).
∵AB∥CD( ),
∴∠1= =30°( ).
已知:如图,AB∥CD,∠B=120°,CA平分∠BCD.求证:∠1=30°.
![](https://img.xkw.com/dksih/QBM/2018/6/21/1971996627263488/1972914812248064/STEM/9b58c347eb4247a3a9dd32711663366b.png?resizew=166)
证明:∵AB∥CD( ),
∴∠B+∠BCD= ( ).
∵∠B= ( ),
∴∠BCD= ( ).
又∵CA平分∠BCD( ),
∴∠2= ( ).
∵AB∥CD( ),
∴∠1= =30°( ).
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【推荐1】如图, 直线
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