解题方法
1 . 如图,在直三棱柱
中,侧面ABCD的面积为
为直角,
,则三棱柱
的外接球的半径取最小值时,四棱锥
的体积为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a01abf5ae85221309ecf031f2cd872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/277d3553963af4243617d1dbe47100e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f8fc3b7d7e1bc8241dc9b87daa79ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a01abf5ae85221309ecf031f2cd872.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
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2 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393f6a6b5bc26570b497cab32df6262e.png)
_____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e10675eddf4f19d5f9fa46788bf62718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393f6a6b5bc26570b497cab32df6262e.png)
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3 . 在平行四边形
中,
为
边上靠近点
的三等分点,
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e070f7f9e7f166b447e0d3a188ce0881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1adebff9fb726cd58eda1ef994890901.png)
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4 . 如图,一摩天轮的半径为50m,最高点到地面的距离为110m,该摩天轮按逆时针方向匀速旋转一周需要
.一游客在摩天轮的舱位转到距离地面最近的位置时进舱,由此接着转动
后,该游客距离地面的高度为__________ m.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23450b6813cd3be44fd92c6dc61e446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962a71e2295bc695d53cdf665d2a16d3.png)
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5 . 已知点
,直线
与
轴相交于点
,则
中,
边上的高
所在直线的方程是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68b0d8f1e6546a3bba0f78e661acad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091c83390d0755e1b72755cf37490351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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6 . 如图所示,在直三棱柱
中,
,
,P是线段
上一动点,则
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a9d9e0846c18e819321146d86bbee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2cea18c8934e88822e18be2c1be0e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb88a50d8b1ba6b57083f55b32de9a05.png)
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7 . 在四面体
中,
,且异面直线
与
所成的角为
,则四面体
的外接球的表面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98236fdd6f09e0cb49aeae8242487c18.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)
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8 . 已知
,则
的值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0de2c0b72c0cb3c8bb08dbac3290de92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184dbf3cdee979a64e01dc89795ebfb0.png)
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9 . 已知正三棱柱
的所有顶点都在表面积为
的球的球面上,
,点
为棱
的中点,点
是侧面
内的一点,且
平面
,则线段
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eea5a7fb6fb9ebab654b7c16706c8a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ad7c84ff3f05cb53cfce047e873609e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655c413f509068d30b165f9d92bdba0.png)
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10 . 已知
是椭圆
的两个焦点,
为椭圆
上的一点,且
,若
的面积为9,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2d54af835ed981959c1c6280815ece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d776753746914c2410a3946c357f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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