名校
1 . 若实数x,y,m满足
,则称x比y接近m,
(1)请判断命题:“
比
接近
”的真假,并说明理由;
(2)已知x>0,y>0,若
,证明:1比p接近
;
(3)判断:“x比y接近m”是“
”的什么条件(充分不必要条件,必要不充分条件,充要条件,既不充分又不必要条件),并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39166dcb83db5e97e87f74cc643dc4e0.png)
(1)请判断命题:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b3a099c4fbb7645f63e639ccf68ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11035ca16eb163c77796f569346be26d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27ff057bd4c1e5c216ed4e338af8949.png)
(2)已知x>0,y>0,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a218d683eee89d69ae3a14b04603600e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7881094ce2f907c3aaf664318ecd3e2d.png)
(3)判断:“x比y接近m”是“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7227b23ba8f9c4c644b51ef955395d.png)
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解题方法
2 . 若数列{an}(n≥2)满足|ak+1-ak|=1(k=1,2,3,…,n-1),则称数列{an}为M数列.记S(An)=a1+a2+a3+…+an(n≥2).
(1)写出一个满足a2=1,a7=0,且S(A7)>0的M数列{an};
(2)若M数列{an}满足a1=2,n=2017,证明:M数列{an}为递增数列的充要条件为a2017=2018;
(1)写出一个满足a2=1,a7=0,且S(A7)>0的M数列{an};
(2)若M数列{an}满足a1=2,n=2017,证明:M数列{an}为递增数列的充要条件为a2017=2018;
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3 . 已知函数
.
(1)判断“
为偶函数”是“
”的什么条件?
(2)证明:
为奇函数的充要条件是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/670cf45fa88b684a532253a9e08e99bf.png)
(1)判断“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b1fbd56bd26d659c14b0dd4c2289df.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/240fa6e7e7eb945b1a01135b8095bd8d.png)
您最近一年使用:0次
2021-03-25更新
|
76次组卷
|
2卷引用:沪教版(2020) 必修第二册 同步跟踪练习 第7章 三角函数 7.2.2 第2课时 余弦函数的奇偶性和单调性
解题方法
4 . (1)证明不等式:
,
;
(2)已知
,
;
;p是q的必要不充分条件,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f078bfe768b5fa21c63e267fb6f38e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff6ca4f85ae2bd2ff3209fd97198ea19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458e3532d82916aac4f7ad21c10f3f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2019-09-13更新
|
447次组卷
|
2卷引用:【全国市级联考 】四川省内江市2018-2019学年高二下学期期末检测数学(理)试题
5 . 已知方程
(
).
(1)设
,方程有三个不同实根,求
的取值范围;
(2)求证:
是方程有三个不同实根的必要不充分条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac603c0b3d1d7fd42bd50222b6ab94d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb9b6fe8959ae9e71e857b6d6fed49.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13d3469fb79917724365db2b2829d512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0c84cafbf166a261fa4dbf66df8c07.png)
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