名校
1 . 已知函数
,若在平面直角坐标系
中,所有满足
的点
都不在直线
上,则直线
的方程可以是__________ (写出满足条件的一个直线方程即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929f7ba342e6003d818e17bf731f70c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aeb5bf2c66a012fa13f908ecfe63dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4562f3225c98cf5cb11b47d98c9cc9c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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名校
解题方法
2 . 如图,已知四面体
中,
平面
,
.
;
(2)若在此四面体中任取两条棱作为一组(
和
视为同一组),则它们互相垂直的组数记为
;任取两个面作为一组(
和
视为同一组),则它们互相垂直的组数记为
;任取一个面和不在此面上的一条棱作为一组(
和
视为同一组),则它们互相垂直的组数记为
,试求
的值;
(3)《九章算术》中将四个面都是直角三角形的四面体称为“鳖臑”.若此“鳖臑”中,
,
,有一根彩带经过平面
与平面
,且彩带的两个端点分别固定在点B和点D处,求彩带的最小长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf10d92f20501e19d25f6f4159aab89.png)
(2)若在此四面体中任取两条棱作为一组(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63313f7ac7402fcb5a9a840db64c6f08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44d3e6a6d73bf0b11d15390c3aacfb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f158b30f049b709eab54a643c927bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08d5ec85c0f40eab756dad34559d9fdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e6f2d263327cf0a9e9ac9b057f8c649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4940ab1ef3aef695811ed69c71902c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e8ab57234dfc54a5315381c59c94f6.png)
(3)《九章算术》中将四个面都是直角三角形的四面体称为“鳖臑”.若此“鳖臑”中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
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