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1 . 由倍角公式
,可知
可以表示为
的二次多项式.对于
,我们有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2104a78b37da636d13e09e5bdb2be10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b752c5b70e8bef980994bfbb88df7cbc.png)
,可见
也可以表示成
的三次多项式.以上推理过程体现了数学中的逻辑推理和数学运算等核心素养,同时也蕴含了转化和化归思想.
(1)试用以上素养和思想方法将
表示成
的三次多项式;
(2)化简
,并利用此结果求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91d0d02d04a3f1b777b0d86e2372e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5ff5a2e7663e6a21ccea3149a10113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e039219978242ec380e66de6cf9bab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2104a78b37da636d13e09e5bdb2be10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b752c5b70e8bef980994bfbb88df7cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/706585b7d68cd2b99f2f671328c318a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e039219978242ec380e66de6cf9bab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefd06c239145a2b6ae87a955aa51414.png)
(1)试用以上素养和思想方法将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aff1dd2db6f898d70a9adef9a0f2ffad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
(2)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06680427974d0fb0ca07d306f92d505a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1064e3198a310f74672b7211ba74071.png)
您最近一年使用:0次
名校
解题方法
2 . 在
中,角A,B,C的对边分别是a,b,c,且
.
(1)求角B的大小;
(2)若
,
,且
,求a.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937594aeca6ecbbb2800fb6e150e7525.png)
(1)求角B的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d142cd1ec2fd73138f8812c169c55f94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be103fd3ce46a6b6f271e60523597c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82b212ffece98b7918f74d67de4e4c5.png)
您最近一年使用:0次
2022-01-07更新
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940次组卷
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3卷引用:陕西省商洛市洛南县第二高级中学2022-2023学年高三上学期三模理科数学试题