解题方法
1 . 下图改编自李约瑟所著的《中国科学技术史》,用于说明元代数学家郭守敬在编制《授时历》时所做的天文计算.图中的
都是以
为圆心的圆弧,
是为计算所做的矩形,其中
分别在线段
上,
.记
,
,
,
,给出四个关系式,其中成立的等式的序号有__________ .
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26dc82f0190a4936645e7b18c9213d7d.png)
②
;
③
;
④
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f29b1f5e9c6827497de9b6e0d74176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789b22e5b8870e32fb85a23ebc15586b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7878423936bda0d3fe504c4cd81bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943417ee5c37d46c0d65b963e5954056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ba1559c69946ca217351d92b264a1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a9781cd710e738d50a0f5c00f72e20d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8781266de41dc6ca3914d02a7280e16a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b3455a9014c1fbbb09859bebdd7896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195767e0063e1607b5a1e1d5e1c043a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/1/7600d6b4-f861-4876-a3b4-cc127a38300e.png?resizew=165)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26dc82f0190a4936645e7b18c9213d7d.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7978476ddb7866bd3e25fbf15334c55c.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93925d7dc74538085c03f1e6944a0b7.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c97a604014d044ae75284ed3b8bee0.png)
您最近一年使用:0次
名校
2 . 如图1,在
中,
,
分别为
,
的中点,
为
的中点,
,
.将
沿
折起到
的位置,使得平面
平面
,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/8ef76929-4cf4-4d0a-80dc-7c3ef3754c48.png?resizew=354)
(1)求证:
.
(2)求直线
和平面
所成角的正弦值.
(3)线段
上是否存在点
,使得直线
和
所成角的余弦值为
?若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0117046e7a37bebe0c7b987a00d2bcb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b3e7c7845a0ec3cbac709fda131764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/8ef76929-4cf4-4d0a-80dc-7c3ef3754c48.png?resizew=354)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51c4114e94bceb198403c1858b9682.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a261474cc7607d31a6324cb4df9c8896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c741af321a8ddaf387fa661f3920ad84.png)
您最近一年使用:0次
2021-02-02更新
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