1 . 给出以下四个命题:
①数列
为等差数列的充要条件是其通项公式为n的一次函数.
②在面积为S的
的边AB上任取一点P,则
的面积大于
的概率为
.
③将多项式
分解因式得
,则
.
④若那么由
,那么由
以及x轴所围成的图形一定在x轴下方.
其中正确命题的序号为_____________ (把所有正确命题的序号都填上)
①数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
②在面积为S的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a80b31f7ad4793b8097d7f5dac0aac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
③将多项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1435e881ed05c7b1280b47f3802adb05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3b71c650bc4dbda4276185105391ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627411fce8e2b6ab40ac1166b45ada6b.png)
④若那么由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec863a58386c4ef4816602a36d9daa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a150a697011857fb86a58647b03caf07.png)
其中正确命题的序号为
您最近一年使用:0次
2020-06-03更新
|
262次组卷
|
2卷引用:陕西省汉中市龙岗学校2020届高三下学期第二十五次质检数学(理科)试题
解题方法
2 . 在
中,内角
所对的边分别为
,且
,有下列四个结论:
①
;
②
是钝角三角形;
③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd44dadf874d7213471a3f4f825c176.png)
④
的最大内角是最小内角的2倍.
其中所有正确结论的序号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5803f6fc09e7ac82fe1b06f57c64c3.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50dddd96130ec007785b8d138be8a12.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd44dadf874d7213471a3f4f825c176.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
其中所有正确结论的序号为
您最近一年使用:0次
3 . 如图,在棱长为
的正方体
中,
是侧面
内的一个动点(不包含四边形
的边),则下列错误 说法的序号是__________ .
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968697326526464/2973001867108352/STEM/7bb6ac83-c81d-4eb7-ba45-eff3d6dc8484.png?resizew=145)
①三角形
的面积为
;
②存在点
,满足
;
③存在无限个点
,使得三角形
是等腰三角形;
④三棱锥
的体积有最大值、无最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968697326526464/2973001867108352/STEM/7bb6ac83-c81d-4eb7-ba45-eff3d6dc8484.png?resizew=145)
①三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7850e88507969a07a9515347b97c7b6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
②存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87e8258e0f105cbad09162b480e3ea5.png)
③存在无限个点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7850e88507969a07a9515347b97c7b6e.png)
④三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926f0aafa25355ba0c5335dc538f4751.png)
您最近一年使用:0次