1 . (1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591048ee5a3480eedec656dc37282407.png)
;
(2)求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591048ee5a3480eedec656dc37282407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a1114d967e7135cc2a10a844e032eb.png)
(2)求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd035738fddfe5e82a1e6202864b0e3.png)
您最近一年使用:0次
2 . 如图,已知
中的弦
将圆分成面积为
的弓形.求圆心角
的大小(要求精确到
或0.001弧度).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5881f1ce9b4172ca346032d0fd1e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f38e65a8ff0b41650dcaccc4539595a1.png)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096449475141632/2097425606017025/STEM/5fbc3e0794234141826766c6e908cea5.png?resizew=183)
您最近一年使用:0次
3 . 如图,将
的两边
、
视为平面反射镜.如果
,在
上有一点
,
,过点
向
射出一束光线在
的点
处反射后折回到
,在
的点
处第二次反射后的反射光束
恰好与边
平行.求
的大小及
的长度(精确到0.01cm).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c211a24e544ded208ea0a2a2aa59bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b5b4142a399670919da9402073bb9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0cb4b2e0a7af501779001e4f6bb6c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d9f2bee4f93e23c07e0aaeecf02f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84fb85c78522640bcaf889f89ad89de9.png)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096449994063872/2097421655244800/STEM/2bb30f4159d948b49242a8dd8ed1339b.png?resizew=116)
您最近一年使用:0次
4 . 给定实数
、
、
.已知复数
、
、
满足:
求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa224ed9be8766a4d0b5138bd57de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a67a742d2a43e907fb1c3a1bdf1d6a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1363c663f843d356cc5539100393ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da79a31a46bafb750eacb542bb59cd41.png)
您最近一年使用:0次