如图,
,
相交于
,
两点,连接
,经过点
的直线与
交于点
,与
交于点
;经过点
的直线与
交于点
,与
交于点
.试说明
与
的位置关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/20/c6661afe-26d1-438b-ba54-31641b6db838.jpg?resizew=158)
23-24九年级上·全国·课后作业 查看更多[2]
更新时间:2023-09-18 21:13:38
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【推荐1】如图,已知∠ACB=30°,∠B=60°,CD⊥AC,问AB与CD平行吗?AD与BC平行吗?若平行请说明理由;若不确定那么再加上什么条件就平行了呢?
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名校
【推荐2】如图,如果
,求证:
;
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观察下面的解答过程,补充必要的依据或结论.
(已知),
(______________),
∴
(_______________),
又∵
(已知),
∴
(____________)(等式的性质)
∴
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又∵
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∴
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
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观察下面的解答过程,补充必要的依据或结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe3339c61fed6f92db19ac6db08fd5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32622affa4df862eb25738ca62cd50c7.png)
∴
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又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23a991db3f33aa8e7a4c5e451d8e95d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ceb0fa61945709b09e10b5d349c4fb9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ebda36dc308a6bdedbef83aa1753d9.png)
∴
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∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6335d528cb315ce614fd75b60acc3b20.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28bc8d9a72f5f532eca72c5da6428f7.png)
∴
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【推荐2】如图,平行四边形
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