在底面是正方形的四棱锥
中,
底面ABCD,点E为棱PB的中点,点F在棱AD上,平面CEF与PA交于点K,且
,则
_________ ,四棱锥
的外接球的体积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9077f16d31c2fb41eb0d16625afde6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8a7a5bbc6c2fa16fd71a5cbfedb780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e313c7d3461e8d263a00522f0b6fd1.png)
22-23高一下·云南文山·期末 查看更多[2]
更新时间:2023-07-25 15:55:12
|
相似题推荐
填空题-单空题
|
较难
(0.4)
解题方法
【推荐1】有下列命题:
①等比数列
中,前
项和为
,公比为
,则
,
,
仍然是等比数列,其公比为
;
②一个正方体的顶点都在球面上,它的棱长为2cm,则球的体积是
cm3;
③若数列
是正项数列,且
,则
;
④在
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c3e458d5342d2bbea3961fb583a55.png)
是边
上的一点(包括端点),则
的取值范围是
.
其中正确命题的序号是_____ (填番号)
①等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5188d6760683a860adab0cda195cdf80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd6fe11dfa538e67bfd63478fc428a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e61fa11a774052fedace1ab2d1a606c.png)
②一个正方体的顶点都在球面上,它的棱长为2cm,则球的体积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2eb9837d18069575f16397d175a6a1.png)
③若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89ceb99c900d3ee2c3fd1c22fe7ba478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a54986ef72e810419d80c6191bf560.png)
④在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c3e458d5342d2bbea3961fb583a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c91e9a0c6a85582538e32ab06b5fc09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ce7dad4e7dee19aa735beb52ae3a69.png)
其中正确命题的序号是
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
名校
解题方法
【推荐2】已知球
是正四面体
的外接球,
为棱
的中点,
是棱
上的一点,且
,则球
与四面体
的体积比为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85f9f40bc84c45140dc351c28363b33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335e2a712f05eae0dba41bd5777cdf31.png)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
【推荐1】四面体
中,
,
,
,且异面直线
与
所成的角为
.若四面体
的外接球半径为
,则四面体
的体积的最大值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa1162d5481e2441fe5bc0d49a576b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
名校
【推荐2】三棱锥S—ABC的四个顶点都在球O的表面上,线段SC是球的直径,
,
,三棱锥S—ABC的体积为
,则球O的表面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
名校
解题方法
【推荐1】在棱长为4的正方体
中,E,F分别是
和
的中点,经过点A,E,F的平面把正方体
截成两部分,则截面的周长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
【推荐2】如图所示,在长方体
中,
,
,
,过
的截面的面积为
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1a56baf43ffdf67bc8460856e31fec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/447bb778-28e0-4802-a160-49db727db5fc.png?resizew=217)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
【推荐1】如图,长方体
中,
,点
为
中点,
为直线
与平面
的交点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b792b59a0739d8b50ea0ce659917a9.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f341fbb2cc0dd2c261bbf8d81bacb62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a7bcc1efb8a2ff57d64b6d057da463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a681d311a864d38cf306a0c137cbcca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b792b59a0739d8b50ea0ce659917a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/f4bd33dc-19a8-450b-ad70-bab03e04d196.png?resizew=170)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
名校
【推荐2】如图,棱长为1的正方体
中,
为线段
上的动点,则下列结论中正确的是_________ .
①平面
平面
;
②过点
,
,
的截面可能为五边形;
③
的最小值为
;
④三棱锥
内切球半径最大值为
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc3141b0ee5994a18e725bbd8a79d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36118a9e86f87ae75f554f8a3fcdb39d.png)
②过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2814a0d93a9cafb77e63a82cd9b67a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2679dd29db749b3bc8a407793a0828.png)
④三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8049311621004b8d0f2637d13010db7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a127536a513fb5798a2807ed21b76848.png)
您最近一年使用:0次