20-21高一·全国·课后作业
解题方法
1 . 如图,在四棱锥
中,
平面ABCD,O为垂足,点M在SO上,且
,经过点M作与底面ABCD平行的平面
,分别交棱SA,SB,SC,SD于点
,
,
,
.
四边形ABCD;
(2)求棱锥
的体积与棱台
的体积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d30637da200a07672ae231b4c5c09cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532fd16bd9716aa326de7f484e90ce4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da360e7790e5610c33f9614e667bca19.png)
(2)求棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a6b39e5ca4f9292eb64b3a355b5125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0424446817f60c18f8e4e3cc202ad99.png)
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