1 . 如图,在三棱柱
中,
底面
,
,
,
,
,
是线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/e11707e5-9b2a-4c22-89d8-62716d4022b4.png?resizew=160)
(1)证明:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3c5d2cbe5cfa47fde68ff3b5b81469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e91c0da042c5af6c3540849bb686bc03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9778ae9823e8430d73d87c57fc47b185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/e11707e5-9b2a-4c22-89d8-62716d4022b4.png?resizew=160)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca714e3eade6d63792b729f4ff9f8316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfe033503db0cacc5ba9f9e97e74618.png)
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2019-01-16更新
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889次组卷
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4卷引用:【校级联考】辽宁省凌源2018-2019学年高二上学期期末三校联考数学(理科)试题