解题方法
1 . 如图,已知在三棱柱
中,
,
,F是线段BC的中点,点O在线段AF上,
.D是侧棱
中点,
.
![](https://img.xkw.com/dksih/QBM/2022/5/5/2972987689132032/2976454550306816/STEM/9c9ad70fad4e41fcb1d588866a8d09af.png?resizew=230)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
平面
;
(2)F,E,
三点在同一条直线上吗?说明理由,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6060d9a82ed5405a1ea8cd824448b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e948030f3273f8a4060db3ea2c02c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4dd6192abb8c1e5fe39e981c726219.png)
![](https://img.xkw.com/dksih/QBM/2022/5/5/2972987689132032/2976454550306816/STEM/9c9ad70fad4e41fcb1d588866a8d09af.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
(2)F,E,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca9051ccb177c47578bab73555962015.png)
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2022-05-10更新
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5卷引用:四川省眉山市2022届高中第三次诊断性考试数学(文史类)试题
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