如图所示,在四面体ABCD中作截面PQR,若PQ与CB的延长线交于点M,RQ与DB的延长线交于点N,RP与DC的延长线交于点K.给出以下命题:
![](https://img.xkw.com/dksih/QBM/2020/11/24/2600038692921344/2600462784872448/STEM/b3bec4debb4e49eeaa2c9f52d191cbd9.png?resizew=114)
①直线
平面
;
②点K在直线
上;
③
,
,
,
四点共面.
其中正确结论的序号为________ .
![](https://img.xkw.com/dksih/QBM/2020/11/24/2600038692921344/2600462784872448/STEM/b3bec4debb4e49eeaa2c9f52d191cbd9.png?resizew=114)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06721267332b12f0a89b1f27bb401767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08361173b096d18b33210a955e109f42.png)
②点K在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
其中正确结论的序号为
2020高三·全国·专题练习 查看更多[1]
(已下线)专题8.3 空间点、直线、平面之间的位置关系(精练)-2021年高考数学(文)一轮复习讲练测
更新时间:2020-11-25 11:17:59
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