名校
1 . 如图所示四棱锥
,底面ABCD为直角梯形,
,
,
,
,
是底面ABCD内一点(含边界),
平面MBD,则点O轨迹的长度为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0046177466c78f08d45449dc5639bf38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e4f29e7892ac90cf9dcdd06fa86c80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02d6d03e83c2e2f6a03bf30dd1038dc6.png)
![](https://img.xkw.com/dksih/QBM/2022/1/26/2902665447546880/2916946144067584/STEM/66337424-081d-45b4-968b-6aa64db414b9.png?resizew=181)
您最近一年使用:0次
2 . 在正方体
中,M,N分别是线段AB1,BC1的中点,以下结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/40bcf3ef-5382-4cab-9dda-199884fc295f.png?resizew=170)
①直线
直线
;②直线
平面
,;③
.
其中正确的是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/40bcf3ef-5382-4cab-9dda-199884fc295f.png?resizew=170)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9147a177a4e548e2003c4814e39df76a.png)
其中正确的是
您最近一年使用:0次
2020-12-11更新
|
231次组卷
|
2卷引用:江西省九江五校2020-2021学年高二上学期期中联考数学(文)试题
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解题方法
3 . 如图,在棱长为
的正方体
中,
,截面
,截面
,则截面
和截面
面积之和__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3921ca52e925d8be79c95d57dfb96497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75ef43979ba61665c72085f9ad8cb25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39695b69fea8beeecc3c6cfce00fbcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3534df651f0a681bc905795b26833107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856c8fca99cfb17d4ac1e84a9a6f0f15.png)
![](https://img.xkw.com/dksih/QBM/2017/11/24/1823950705262592/1826147410657280/STEM/d909d78f9c1b476c808489efc33fa577.png?resizew=210)
您最近一年使用:0次
2017-11-27更新
|
728次组卷
|
2卷引用:江西省九江第一中学2017-2018学年高一上学期第二次月考数学试题