如图,在网格内有一条直线l,有点A,B,C,请你通过A,B,C三点分别作平行于l的直线.
![](https://img.xkw.com/dksih/QBM/2019/3/1/2151171476135936/null/STEM/3979cbfa6bb7453e84bdaf3ffa039761.png?resizew=154)
18-19七年级下·全国·课后作业 查看更多[1]
(已下线)2018-2019学年七年级下学期数学教材解读(沪科版)10.2 平行线的判定同步分层训练(同步测试)
更新时间:2019-03-05 08:03:21
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【推荐1】如图,小海龟(头朝上)位于图中点
处,按下述口令移动:前进
格;向右转
,前进
格;向左转
,前进
格;向左转
,前进
格;向右转
,后退
格;最后向右转
,前进
格;用粗线将小海龟经过的路线描出来,看一看是什么图形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/e6e7a0f6-aecf-4062-b50b-497c755b718e.png?resizew=129)
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【推荐1】在七年级下册《相交线与平行线》一章中,我们用测量的方法得出了“两直线平行,同位角相等”这一性质.在九年级上册
页学习反证法时对这一性质进行了证明.请大家阅读下列证明过程并把它补充完整:
已知:如图1,直线
,直线
分别与
、
交于点O,
.
求证:
.
![](https://img.xkw.com/dksih/QBM/2023/1/9/3149002103734272/3150026914807808/STEM/3bc7a99e0fb64b458dd40c4e522507d2.png?resizew=321)
(1)完成下面证明过程(将答案填在相应的空上):
证明:假设____________.
如图2,过点O作直线
,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae52af5ce89be9d6c1898ec1ac4a158.png)
∴
( )
又∵
,且直线
经过点O
∴过点O存在两条直线
、
与直线
平行
这与基本事实矛盾,假设不成立
∴
.
(2)上述证明过程中提到的基本事实是_________.(填序号)
①两点确定一条直线;②过已知直线外一点有且只有一条直线与已知直线平行;③平行于同一条直线的两条直线互相平行.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f539956309408761c52ee9031ededd6.png)
已知:如图1,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/12fe32dfbd66709875c5b9f79c9496da.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/2023/1/9/3149002103734272/3150026914807808/STEM/3bc7a99e0fb64b458dd40c4e522507d2.png?resizew=321)
(1)完成下面证明过程(将答案填在相应的空上):
证明:假设____________.
如图2,过点O作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae52af5ce89be9d6c1898ec1ac4a158.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7404056437aa12bbf7da5b26eb3fc02e.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴过点O存在两条直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
这与基本事实矛盾,假设不成立
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
(2)上述证明过程中提到的基本事实是_________.(填序号)
①两点确定一条直线;②过已知直线外一点有且只有一条直线与已知直线平行;③平行于同一条直线的两条直线互相平行.
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【推荐2】如图,在四边形ABCD中,
,
,BD⊥CD于D,EF⊥CD于F,判断∠1与∠2的关系并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc07473442173d8f1fa77c14819ea5bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a312c72509eaecc09aeaa97427e959ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/68554fb4-69e5-48e8-b238-33a276721445.png?resizew=194)
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