1 . 如图,在直三棱柱
中,底面
为正三角形,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2020/12/20/2618475349975040/2624805250285568/STEM/2e462115f15a4c8ea410e0f3ebe8b8ec.png?resizew=185)
(1)求三棱锥
的体积;
(2)过直线
作一个平面
与平面
平行在图中保留作图痕迹,并写出作图方法(不用说理由).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565517c781e119de8d8e9c9f29e4e2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2020/12/20/2618475349975040/2624805250285568/STEM/2e462115f15a4c8ea410e0f3ebe8b8ec.png?resizew=185)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c224b2f296216e50a38cd465ea1077d.png)
(2)过直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
您最近一年使用:0次
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解题方法
2 . 某石油勘探队在某海湾发现两口大型油气井,海岸线近似于双曲线
的右支,现测得两口油气井的坐标位置分别为
,
,为了运输方便,计划在海岸线上建设一个港口,当港口到两油气井的距离之和最小时,港口的位置为______ .(填写坐标即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67a8bc1791a9c09bde4866854f67a2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5b7863de77d7c636b12a79aba8e649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d6328a6ae1da97b679adc1da5e603e8.png)
您最近一年使用:0次
2022-12-14更新
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207次组卷
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3卷引用:重庆市长寿区八校联考2023-2024学年高二上学期期末检测数学试题(B卷)