如图,
,
,
平分
,若
,求
的度数.下面是小明同学的解答过程,请在括号内填上恰当的依据.
![](https://img.xkw.com/dksih/QBM/2022/11/1/3100275935854592/3100559870910464/STEM/bca8745a37674f13be804118fa85c953.png?resizew=169)
解:
,
,
∴
,( )
,( )
∵
平分
,
∴
,( )
∴
,( )
∵
,
∴
,( )
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b85c1d3d1b63519a0cbfe6ddcbcdf22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/402ab8c49c4dd2aaa0ef47164c7cac00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
![](https://img.xkw.com/dksih/QBM/2022/11/1/3100275935854592/3100559870910464/STEM/bca8745a37674f13be804118fa85c953.png?resizew=169)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b85c1d3d1b63519a0cbfe6ddcbcdf22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640e9e7c56e8eeda044fb55396088816.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e041036c7236149b6f3a85b4a851d045.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d88ec2d689c9c6cc2f77762cfd2445.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e96acf9500fa9edfd3ff704aa2032e3d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03dce37a20fef774ba63eefdd309d6f9.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/402ab8c49c4dd2aaa0ef47164c7cac00.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e997a15031cc42f2ab30557372030d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c62d28755c9167a00f7f14df32d6e85.png)
21-22七年级下·陕西西安·期中 查看更多[4]
陕西省西安市新城区爱知中学2021-2022学年七年级下学期期中数学试卷(已下线)相交线与平行线02练基础(已下线)考点2平行线山东省枣庄市滕州市滕州育才中学2022-2023学年七年级下学期期中数学试题
更新时间:2022-11-02 00:48:07
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解答题-问答题
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名校
【推荐1】如图,直线
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【推荐2】如图,直线
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平分
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2eaf2acb7e954cc0c4aacdc1f29f34.png)
(1)写出与
互余的角
(2)若
,求
的度数
![](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/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2eaf2acb7e954cc0c4aacdc1f29f34.png)
(1)写出与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843adec8fba1741ccb81a9017cfb815f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ad433ff3e6af6008118644d2fb25d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
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解答题-证明题
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【推荐1】按要求完成下面的证明过程(括号里填依据):已知:如图,点D在射线OA上,OC平分∠AOB,且
,DE平分∠ADC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/7b49e24c-78d2-4ca3-9438-5fde08ce3507.png?resizew=269)
求证:
.
证明:∵
,(已知)
∴∠ADC=∠________,(______________)
∵OC平分∠AOB,DE平分∠ADC,(已知)
∴
,
,(______________)
∴∠BOC=∠CDE,(等量代换)
∵
,(已知)
∴∠________=∠BOC,(______________)
∴∠CDE=∠_______,(等量代换)
∴
.(______________)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72379f374b0deab19f62527f031006a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/7b49e24c-78d2-4ca3-9438-5fde08ce3507.png?resizew=269)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa317c983e05adf97f25ba296d367fc.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72379f374b0deab19f62527f031006a5.png)
∴∠ADC=∠________,(______________)
∵OC平分∠AOB,DE平分∠ADC,(已知)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac25348b320ab089973ac2125245a95a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/016fed757f4a29ddaaa19b0a4e0e1da8.png)
∴∠BOC=∠CDE,(等量代换)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72379f374b0deab19f62527f031006a5.png)
∴∠________=∠BOC,(______________)
∴∠CDE=∠_______,(等量代换)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa317c983e05adf97f25ba296d367fc.png)
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【推荐2】如图,在△ABC中,点D在BC上,∠ADB=∠BAC,BE平分∠ABC,过点E作EF/AD,交BC于点F
![](https://img.xkw.com/dksih/QBM/2020/5/24/2469867176230912/2470561237540864/STEM/a192e171-b84c-4a44-afa3-9abe5866b200.png?resizew=310)
(1)求证:∠BAD=∠C;
(2)若∠C=20°,∠BAC=110°,求∠BEF的度数.
![](https://img.xkw.com/dksih/QBM/2020/5/24/2469867176230912/2470561237540864/STEM/a192e171-b84c-4a44-afa3-9abe5866b200.png?resizew=310)
(1)求证:∠BAD=∠C;
(2)若∠C=20°,∠BAC=110°,求∠BEF的度数.
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解答题-问答题
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【推荐1】完成推理填空.填写推理理由:
如图:
,
,
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的过程填写完整.
![](https://img.xkw.com/dksih/QBM/2021/9/29/2818542056775680/2826471394074624/STEM/47c7b4a2-e9fd-46d0-9129-67e4d92380dc.png)
∵
(已知)
∴
______,(____________).
又∵
,(____________).
∴
,(等量代换)
∴
______,(____________).
∴
_____
,(____________).
又∵
,
∴
_____.
如图:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb5f97d47fbb49fcfcdc7f5e882a80b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
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∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb5f97d47fbb49fcfcdc7f5e882a80b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc310194575262fb45352c2fbc19868.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e8d2059674d0d453dfb3e966e92122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9693da3141d4af5e8deb0fd17dd5aeb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad37b969c35d38dcdbf02e5d0f39afca.png)
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【推荐2】一副三角尺按如图所示的方式摆放,
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