1 . 为了对
,
两个变量进行统计分析,现根据两种线性模型分别计算出甲模型的相关指数为
,乙模型的相关指数为
,则___________ (填“甲”或“乙”)模型拟合的效果更好.
![](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/82fd967ab0d201bc6aec945dadc96055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5156730d9f233aa293a551d3fe7caf98.png)
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2021-09-01更新
|
341次组卷
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2卷引用:广西玉林市第十一中(六校联考)2020-2021学年高二下学期期中考试数学(文)试题
2 . 已知复数
满足
,则复数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d67321ace1e6b3be0fc0e5e8130022.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee3f7565449c0b536683c6ba4a04d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d67321ace1e6b3be0fc0e5e8130022.png)
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3 . 设复数
,
,满足
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41813be61104fce7a33368d0a4429651.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68f652b4c13657ffddf3c9e7eb262b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa224ed9be8766a4d0b5138bd57de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e2f9fbd4c335cac78f1d1bcfc8e1590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56bd60194534e5488f4a2fb2dd34d63d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1ca9138ba3244c10576fc4d5cbfed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41813be61104fce7a33368d0a4429651.png)
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2021-08-31更新
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807次组卷
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6卷引用:江苏省南通市如东县2020-2021学年高一下学期期中数学试题
江苏省南通市如东县2020-2021学年高一下学期期中数学试题(已下线)考点45 数系的扩充与复数的引入-备战2022年高考数学一轮复习考点帮(浙江专用)(已下线)7.1 复数的概念(精练)-2021-2022学年高一数学一隅三反系列(人教A版2019必修第二册)(已下线)7.1 复数的概念江西省吉安市安福二中、井大附中、吉安县三中、遂川二中2021-2022学年高二下学期四校联考(第三次月考)数学(文)试题(已下线)高一数学下学期期中精选50题(提升版)-2021-2022学年高一数学考试满分全攻略(人教A版2019必修第二册)(原卷版)
4 . 已知复数
,若
为纯虚数,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3568f88dd69d738e979e47890dccf1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec04f844e8fd9d9b1ef835e23eaa54e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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5 . 在复数范围内,将多项式
分解成为一次因式的积,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520099c0d930dcf19453e73ed7829855.png)
_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5235adc816c0ad347320b93327b5768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520099c0d930dcf19453e73ed7829855.png)
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6 . 若由一个
列联表中的数据计算得
的观测值
,那么有________ 的把握认为两个变量有关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2581192317ef233ccdccfc48ac29b52b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed1e9cd8ec817de2f35f816365ccf2b.png)
0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
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解题方法
7 . 设
是虚数单位,若复数
是纯虚数,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579743813856e2a9183f5ec6eaaefbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0dfbe2814274d665005d80b5c7de554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
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2021-08-31更新
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290次组卷
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3卷引用:江苏省南京市江宁区2020-2021学年高一下学期期中数学试题
江苏省南京市江宁区2020-2021学年高一下学期期中数学试题(已下线)考点45 数系的扩充与复数的引入-备战2022年高考数学一轮复习考点帮(浙江专用)上海市奉贤区致远高级中学2022届高三上学期期中教学评估数学试题
8 . 试求
的值,由此推测![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5bcae30bf1f244dff21f380d83579f.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2120bb5fcf5d644a369647136e41f845.png)
_______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/690c0e23f410f42c3345de4a6a4256fa.png)
________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/939170c8601722af75a057c498d6c860.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902117d4432af8d2c751903422b9635a.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e29087130b4c3b371a97a383953382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5bcae30bf1f244dff21f380d83579f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2120bb5fcf5d644a369647136e41f845.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/690c0e23f410f42c3345de4a6a4256fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/939170c8601722af75a057c498d6c860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902117d4432af8d2c751903422b9635a.png)
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2021-08-31更新
|
77次组卷
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2卷引用:陕西省咸阳市武功县2020-2021学年高二下学期期中理科数学试题
解题方法
9 . 定义运算
,则符合条件
的复数
的共轭复数
在复平面内对应的点在第______ 象限.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67eec057c30ac58b75b302525b0e134b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7920e280c60fe3c16caa488a8737482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcfebd9f5a57036e6df6b6e14865da3.png)
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解题方法
10 . 已知复数
满足:
,其中
为虚数单位,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e0aeeb125cfb42e33094594d4381f5.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623d7541c38af0f0b7ff913e8f3e3373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e0aeeb125cfb42e33094594d4381f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
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