1 . 如图,在三棱锥
的平面展开图中,B,A,D三点共线,△ABC三个内角A,B,C所对的边分别为a,b,c、且
.
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975788994904064/2978286823301120/STEM/15a47800-43d6-4839-bcd6-a02ccac04127.png?resizew=214)
(1)求∠BAC的大小;
(2)若
,且___________,求AF.
从以下三个条件中任选一个补充到题目中,并完成解答.
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480a62e9e4467879fb8b18ca690b6f04.png)
②△BCD的面积为10,
;
③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e30e6a8ac35fdd24f54b178597d870.png)
注:选择多个条件分别解答,按第一个解答计分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95449eba2de08c51dce377a0fef46238.png)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975788994904064/2978286823301120/STEM/15a47800-43d6-4839-bcd6-a02ccac04127.png?resizew=214)
(1)求∠BAC的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c369fb33671c3315decc33bf55bf7a9.png)
从以下三个条件中任选一个补充到题目中,并完成解答.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480a62e9e4467879fb8b18ca690b6f04.png)
②△BCD的面积为10,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfde2101b1b3fe9489ec780d56cb05d.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e30e6a8ac35fdd24f54b178597d870.png)
注:选择多个条件分别解答,按第一个解答计分
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2022-05-13更新
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2卷引用:福建省漳州市2022届高三第三次质量检测数学试题