使用科学、正确的方法证明.
(1)已知
,试用分析法证明:
.
(2)已知
,
,求证
与
中至少有一个小于2.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6c5526947e9bef051bc3bdf7fd186d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b1411bbc505b5056e68e077d18e06b.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0bd65eb59d0acde6f5955490696c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9e131cdd242d56b6dba05ab3363ef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fe4e9871c2acac03e9a3388fd2877e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2b29b47d6c7753d5359883c105c68d.png)
更新时间:2023-02-23 15:17:53
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解答题-证明题
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适中
(0.65)
解题方法
【推荐2】已知函数
.
(1)若
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.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe589eca001b0816009c7e1d083a2c7.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aaee11552fe4c0863c104364d923359.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若正数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b6768f57d615696d5e44736edcf1c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/580e71f257bca2d1c4ad237d9db9c46a.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
解题方法
【推荐1】关于复数
的方程
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(1)若此方程有实数解,求
的值;
(2)用反证法证明:对任意的实数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0163bfb707c720902bbfe11693fea1.png)
(1)若此方程有实数解,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)用反证法证明:对任意的实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】已知数列
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…
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证明:从该数列中至少可以找到3个正数和3个负数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e76d1d8e50dda4d50229a8a20c57e58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb67a412ec606ae0b05fe9e0a1e3d1ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4cc3662ea273bd291149c21f546d9d.png)
…
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81eee574d20bc649246e849b4e3a1fac.png)
证明:从该数列中至少可以找到3个正数和3个负数.
您最近一年使用:0次