2023高三·全国·专题练习
1 . 设
,
是两个实系数非零多项式,且存在实数
使得
记
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14895b71b7bee6334172f84f0554931f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f65c792161a7882d13ae01b824453d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98ff9ba195418273adfd773f78c8a5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ed6dbdc5c0a115edac62a1eac695c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4720c811fe1d71070124bf972d9c5073.png)
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2 . 设多项式
,证明:
至少有一个根为虚根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7f6db9749ef0622795c4ba265a577f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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2023高三·全国·专题练习
3 . 证明实系数奇数次多项式必有一实数根.
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4 . 设
是一个
次多项式,且
证明:
其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14895b71b7bee6334172f84f0554931f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/257e61018107dd1618cb5c8e34722865.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca54a3c1ca18b4f99c445f1a280ec9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd82edc39d053d5ab04075e530763be.png)
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5 . 设
,满足
又设
满足
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6af3f54ea28a8d7df50ad784861176a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7850844ff8e0e33feadd667b69699e2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850bc4fdf0ae1043eb3601b66bbfe1d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8b13b8ed35ce32dd3899a0f6bdb418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef6887683a63bdae917280b410ec877.png)
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2023高三·全国·专题练习
6 . 已知实数
和正实数
使得关于
的一元二次方程
有两个不同的实根,且恰有一个根落在闭区间
中.证明:恰有一个根在开区间
中.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1146110d4382c714c10de00dd1273b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab0dcfadc782654c0e25b54e0fdbe4e.png)
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7 . 设
、
是无穷复数数列,满足对任意正整数n,关于x的方程
的两个复根恰为
、
(当两根相等时
).若数列
恒为常数,证明:
(1)
;
(2)数列
恒为常数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80289c798034033f2f7cfcd7590f2344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3282e5fde4ae53fcb1bb072a685304c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3002f56900c2924bfd79fc3865b0a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52cabfa2464501decf05aed007cbaf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841f4ea50fa0c2b4c6e47dc04597abba.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/561d594ed04e6652c75dac56259f4292.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解题方法
8 . 关于x的实系数方程
.
(1)设
(i是虚数单位)是方程的根,求实数a,b的值;
(2)证明:当
时,该方程没有实数根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6cbf4c4e4fb18b5e45be298b58ec049.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1fab740036f2ecc7858e0ce7e614688.png)
(2)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300db71a4fd3c0527282211db7d18f36.png)
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2020-02-12更新
|
1122次组卷
|
3卷引用:第十二章 复数(知识归纳+题型突破)-单元速记·巧练(苏教版2019必修第二册)
(已下线)第十二章 复数(知识归纳+题型突破)-单元速记·巧练(苏教版2019必修第二册)人教A版(2019) 必修第二册 过关斩将 第七章 复数 本章复习提升第五章 复数 测评-北师大版(2019)高中数学必修第二册