名校
1 . 已知命题
:方程
的两根都是实数,
:方程
的两根不相等,试写出由这组命题构成的“
或
”、“
且
”、“非
”形式的命题,并指出其真假.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e09328a5259b377a3b5f95e86f32df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e09328a5259b377a3b5f95e86f32df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
您最近一年使用:0次
解题方法
2 . 已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
.若
是
的必要不充分条件.求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d9978c8d7f134dec3f163dc838341aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a82ec13594ed52a231c0a2e976331f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e26b38e357c7d985656ba7bb3c794a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2014·广东韶关·一模
3 . 某学校随机抽取部分新生调查其上学路上所需时间(单位:分钟),并将所得数据绘制成频率分布直方图(如图),其中,上学路上所需时间的范围是
,样本数据分组为
,
,
,
,
.
(1)求直方图中
的值;
(2)如果上学路上所需时间不少于40分钟的学生可申请在学校住宿,请估计学校1000名新生中有多少名学生可以申请住宿.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3adf42f962e57175d469f16f587b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50887500bb527235179953ab1c882a53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e3d0b595faa151af3ecff0f3af0489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b1ae7da581f795bd0c882690e31199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375152e5136ae81fdf01ff7384b61a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e0c0e1d1afae5cd215295e32bc48123.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/c5b8d684-880b-4a04-98a4-818ad91facef.png?resizew=194)
(1)求直方图中
![](https://img.xkw.com/dksih/QBM/2014/6/13/1571771083849728/1571771089616896/STEM/d1367d6f9e7c4b199c0ee6a9246a5b06.png?resizew=14)
(2)如果上学路上所需时间不少于40分钟的学生可申请在学校住宿,请估计学校1000名新生中有多少名学生可以申请住宿.
您最近一年使用:0次
2016-12-02更新
|
621次组卷
|
6卷引用:2014届广东省韶关市高三调研测试文科数学试卷
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