名校
解题方法
1 . 下列命题中正确命题的个数是( )
(1)若扇形的面积为
,半径为1,则扇形的圆心角为
;
(2)已知
,
,
三点共线,则实数x=-3;
(3)如果满足B=60°,b=12的
有且只有一个,则a的范围是
或
;
(4)幂函数
(
)的图象关于y轴对称,且在
是减函数,则n=1.
(1)若扇形的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c50b74319496ee015047acdbe8b9ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b199d124fb9a5bc8438c9884f04534.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da927eda15e4af160175ce6136f0404e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5886f13f0efbe6da4a8fe5a086f6125b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5dd58aa5f4533762e56720d2431d27.png)
(3)如果满足B=60°,b=12的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac82fbd485f6241f33bb0168d954892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185138028f9566d817f17e003d41c49b.png)
(4)幂函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ea8af93b3376804c906e0a4e1ededa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f02d5c8eec434a3f90348d770a2e2b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
A.1 | B.2 | C.3 | D.4 |
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2022-05-17更新
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170次组卷
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2卷引用:四川省德阳市第五中学2021-2022学年高一下学期3月月考数学(理)试题