定义:如果一个数的平方等于
,记为
,这个数i叫做虚数单位,那么和我们所学的实数对应起来就叫做复数,表示为
(a,b为实数),a叫这个复数的实部,b叫做这个复数的虚部,它的加、减、乘法运算与整式的加、减、乘法运算类似.
例如:计算:
;
.
(1)填空:
____,
____.
(2)用运算律计算:①
____;②
____.
(3)解方程:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73be79c02db553929619d957187e2077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc228995efbba2e64d7f1de747024cc4.png)
例如:计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b06fe21d8307307bc08135943f3a108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881543e58e1bd029da7a5844b97e73db.png)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350981ff121f7f03ee420461499300b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45b691a408f1d5362bd7675f5bfb257.png)
(2)用运算律计算:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac78dacc9fc8aa8408481393e353ce77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/205161d8ca06eff8abbec2c6a0d8eeb9.png)
(3)解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/970723402c3160ecc52da95dcc7f7669.png)
更新时间:2024-04-25 15:31:58
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相似题推荐
解答题-问答题
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【推荐1】如图是一块正方形纸片.
,则此正方形的对角线
的长为
.
(2)若一圆的面积与这个正方形的面积都是
,设圆的周长为
,正方形的周长为
,则
(填“
”或“
”或“
”号)
(3)如图2,若正方形的面积为
,李明同学想沿这块正方形边的方向裁出一块面积为
的长方形纸片,使它的长和宽之比为
,他能裁出吗?请说明理由?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc263cb608e288dc818475eec841ee5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af089fd292ba69ddef79e9ab1cac77ca.png)
(2)若一圆的面积与这个正方形的面积都是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d795beaffb7109d3c5aafdeef75b1f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5ab0d1ca4941e3392b7b7a90620c60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e269549a996e690292a57a57375edd6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5ab0d1ca4941e3392b7b7a90620c60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e269549a996e690292a57a57375edd6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
(3)如图2,若正方形的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab68ead569d30a9f1a2803d3fa8d4824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f9bc55e6fb5a95fb6d5495b9335d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b1dcdac71e394e495d069f64e1f1ce9.png)
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【推荐2】(1)在实数范围内定义运算“⊕”,其法则为:a⊕b=a2﹣b2,求方程(4⊕3)⊕x=24的解.
(2)已知2a的平方根是±2,3是3a+b的立方根,求a﹣2b的值.
(2)已知2a的平方根是±2,3是3a+b的立方根,求a﹣2b的值.
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名校
【推荐1】定义:如果一个数的平方等于
,记为
,这个数
叫做虚数单位.那么形如
(
为实数)的数叫做复数,
叫这个复数的实部,
叫做这个复数的虚部,它的加,减,乘法运算与整式的加,减,乘法运算类似.例如计算:(2+
)+(3-4
)=5-3
.
(1)填空:
= ,
= .
(2)计算:①
;
②
;
(3)试一试:请你参照
这一知识点,将
(
为实数)因式分解成两个复数的积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73be79c02db553929619d957187e2077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc228995efbba2e64d7f1de747024cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](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/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed9cceee603afe981542717871ad3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7058ecf81980c5c2e6d4fee928b3d37.png)
(2)计算:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01f413ee1ea77e0a0985d48aa62a616.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263ffb147bab308a5e4e61a1b1e83d23.png)
(3)试一试:请你参照
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73be79c02db553929619d957187e2077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ba912c9d3a115c6168d4124bcbccf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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真题
解题方法
【推荐2】阅读以下材料,苏格兰数学家纳皮尔(J.Npler,1550-1617年)是对数的创始人,他发明对数是在指数书写方式之前,直到18世纪瑞士数学家欧拉(Evler.1707-1783年)才发现指数与对数之间的联系.
对数的定义:一般地.若
(
且
),那么x叫做以a为底N的对数,
记作
,比如指数式
可以转化为对数式
,对数式
可以转化为指数式
.我们根据对数的定义可得到对数的一个性质:
,理由如下:
设
,则
.
.由对数的定义得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8eff34d4818d907621714b4dda96d1.png)
又![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f36cb88fc1388103ded3319ed653a3.png)
.
根据上述材料,结合你所学的知识,解答下列问题:
(1)填空:①
___________;②
_______,③
________;
(2)求证:
;
(3)拓展运用:计算
.
对数的定义:一般地.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b5a213235f7d61e6b1c4663ad8d773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
记作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9057739b0e72e972943cafa8e8d675f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98ee95e5ee04de63ee34a524d5889d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/275cacdc2c3ad1080b2b0c7226c7d072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e620ae7c880e0758ea97f6d54df3dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738317df2665c72d92812b7714675549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddcaa81c10ad9630c8315f681fc4346.png)
设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48b5cd01f80babbd6106bc37944e696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae58116b05a52bf612b91d3fe7b052a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d0e6d63b4504af30201d9fa3c09ca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8eff34d4818d907621714b4dda96d1.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f36cb88fc1388103ded3319ed653a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648de298b93bbfe1d9d258e5dd20ff35.png)
根据上述材料,结合你所学的知识,解答下列问题:
(1)填空:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe1f3d9cbb27748fcc042b0c3da8974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e680a4b55736c8e6feaad07f9140a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbc5f57948814ab93547388f862546f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73ecfa265a7177b12cad7a87a7b9c445.png)
(3)拓展运用:计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f0033fa1487f28aa7146fcbb619864.png)
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【推荐1】乘法公式的探究及应用.
(1)如上左图,可以求出阴影部分的面积是 (写成两数平方差的形式);
(2)如上右图,若将阴影部分裁剪下来,重新拼成一个长方形,它的宽是 ,长是 ,面积是 (写成多项式乘法的形式)
(3)比较左、右两图的阴影部分面积,可以得到乘法公式 . (用式子表达)
(4)灵活利用公式计算:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/05f98224-807e-46ec-b9d2-46483ce93af8.png?resizew=415)
(1)如上左图,可以求出阴影部分的面积是 (写成两数平方差的形式);
(2)如上右图,若将阴影部分裁剪下来,重新拼成一个长方形,它的宽是 ,长是 ,面积是 (写成多项式乘法的形式)
(3)比较左、右两图的阴影部分面积,可以得到乘法公式 . (用式子表达)
(4)灵活利用公式计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74587b0a8a6e383bf7b4bc5393a8ef17.png)
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【推荐1】已知
,
.
(1)观察,计算,判断:(填“>”,“<”,“=”).
①当
,
时,
______
;
②当
,
时,
______
;
③当
,
时,
______
;
(2)根据(1)中问题的结论,猜想
与
的数量关系,并证明你的结论;
(3)若要围成面积为
的长方形场地,直接写出长方形场地周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a34d6f60032718820c3da2b07786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90e8d5d7fed033f48270b1ff825fcd5.png)
(1)观察,计算,判断:(填“>”,“<”,“=”).
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d7009d4cbe7157d63ce50444443716.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d7009d4cbe7157d63ce50444443716.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d7009d4cbe7157d63ce50444443716.png)
(2)根据(1)中问题的结论,猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d7009d4cbe7157d63ce50444443716.png)
(3)若要围成面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9897ea0f650df967b09b5b5944fea9.png)
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【推荐2】观察下列等式:
;
;
…
(1)猜想并写出第6个等式
________;
(2)猜想并写出第n个等式
________;
(3)证明(2)中你猜想的正确性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac467bf01742227358b38a58c443a674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3588664c96c9935e526106923eab3a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d43f62e55813e494da072906a1b130ce.png)
(1)猜想并写出第6个等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ebce85ea9bc18815ef8887057030a63.png)
(2)猜想并写出第n个等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
(3)证明(2)中你猜想的正确性.
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