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1 . 已知在直三棱柱
中,
,
,若棱
在正视图的投影面
内,且
与投影面
所成角为
.设正视图的面积为
,侧视图的面积为
,当
变化时,
的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90e17995e2f71e297d94ae51c7e5b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9763308b1931b24aac571e9624fd6c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1019d4ad2e3fb4a7abb66e0e9e55b556.png)
![](https://img.xkw.com/dksih/QBM/2018/5/15/1946000401719296/1947181552713728/STEM/68a80470-d28e-43ba-980c-07f56000db8c.png?resizew=171)
您最近一年使用:0次
2018-05-17更新
|
1973次组卷
|
6卷引用:河北省衡水中学2018届高三第十六次模拟考试数学(理)试题
河北省衡水中学2018届高三第十六次模拟考试数学(理)试题河北省衡水中学2018届高三十六模理科数学试题(已下线)2017-2018学年度下学期高中期末备考 【浙江版】高二【精准复习模拟题】 提高卷01【教师版】【市级联考】河南省驻马店市2019届高三上学期期末考试数学(理)试题【全国百强校】河南省南阳市第一中学2019届高三第十四次考试数学(理)试题【全国百强校】河北省武邑中学2019届高三下学期第一次模拟考试数学(理)试题
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2 . 某几何体的主视图和俯视图如图所示,在下列图形中,可能是该几何体左视图的图形是________ .(写出所有可能的序号)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189509246509056/2191436690956288/STEM/e74453f97c784e22ae08f5dc54d3162e.png?resizew=95)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189509246509056/2191436690956288/STEM/057e0f3933604693980e20b6432913f5.png?resizew=95)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189509246509056/2191436690956288/STEM/e74453f97c784e22ae08f5dc54d3162e.png?resizew=95)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189509246509056/2191436690956288/STEM/057e0f3933604693980e20b6432913f5.png?resizew=95)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189509246509056/2191436690956288/STEM/62df29f9b74d4631946b0d6b6df176a8.png?resizew=328)
您最近一年使用:0次
2018-05-04更新
|
915次组卷
|
2卷引用:【全国市级联考】北京市海淀区2018届高三第二学期期末练习(二模)数学(文)试题