计算:
(1)
.
(2)
.
(3)
.
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35649559d58b87e2615ab9b80a570edf.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c72df03d5567fb91f6a30609fc868e.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97e13a7aa7b7d39abf26f40c0aa4f94.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb83c71632bec4e57c781cb4b80ff3e.png)
更新时间:2019-11-18 19:34:05
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【推荐2】已知一个正数的两个平方根是m+3和2m﹣15
(1)求m和这个正数;
(2)求m+5的算术平方根.
(1)求m和这个正数;
(2)求m+5的算术平方根.
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【推荐1】先阅读下列材料,然后解题:
材料:因为
,所以
,即
能被
整除.所以
是
的一个因式,且当
时,
.
(1)类比思考
,所以
,即
能被______整除,所以______是
的一个因式,且当x=______时,
;
(2)拓展探究:根据以上材料,已知多项式
能被
整除,试求m的值.
材料:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d690c367d61bdb4a64f1206ad6cb21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac4d46cb160dd015c2c9299ea268e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53d52b96a715e591b44cf4f7ac4c6b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c3fa8692612e51579e3cef22fd8c4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c3fa8692612e51579e3cef22fd8c4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53d52b96a715e591b44cf4f7ac4c6b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08587591cfb5275dc14d5bb66a397e93.png)
(1)类比思考
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/330b621cb1922448cba6615610d53b2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef1160933e6ed7ae14b0b4eeb2fd8b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbe4f6709485516dbd81c311fc07881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbe4f6709485516dbd81c311fc07881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56e774c48d99c7834d4a02d855a5e95.png)
(2)拓展探究:根据以上材料,已知多项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc30d9adf4a6be0c81b779b8680fdf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39241f2eeccaa16d0550d851619bcb42.png)
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【推荐1】对于任何实数,我们规定符号
,例如:
.
(1)按照这个规定请你计算
的值;
(2)按规定请写出
的结果;
(3)当a取
的相反数时,请计算
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7bf3fe6beb2d06f350e13d2d5c001c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2904f12f363b202cb9fc6659bc28c4f2.png)
(1)按照这个规定请你计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93b8cff4ac3952431da84b90f70c7867.png)
(2)按规定请写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc39deae33a1485add8a67123caedf26.png)
(3)当a取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc39deae33a1485add8a67123caedf26.png)
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【推荐2】阅读下列文字,并解决问题.
已知x2y=3,求2xy(x5y2﹣3x3y﹣4x)的值.
我们知道,满足x2y=3的x,y的值可能较多,不可能逐一代入求解,而运用整体思想能使问题化繁为简,化难为易,运用整体代入的方法能巧妙地解决一些代数式的求值问题,于是将x2y=3整体代入.
解:2xy(x5y2﹣3x3y﹣4x)
=2x6y3﹣6x4y2﹣8x2y
=2(x2y)3﹣6(x2y)2﹣8x2y
=2×33﹣6×32﹣8×3
=﹣24.
请你用上述方法解决问题:
(1)已知ab=4,求(2a3b2﹣3a2b+4a)•(﹣2b)的值;
(2)已知x﹣
=5,求
的值.
已知x2y=3,求2xy(x5y2﹣3x3y﹣4x)的值.
我们知道,满足x2y=3的x,y的值可能较多,不可能逐一代入求解,而运用整体思想能使问题化繁为简,化难为易,运用整体代入的方法能巧妙地解决一些代数式的求值问题,于是将x2y=3整体代入.
解:2xy(x5y2﹣3x3y﹣4x)
=2x6y3﹣6x4y2﹣8x2y
=2(x2y)3﹣6(x2y)2﹣8x2y
=2×33﹣6×32﹣8×3
=﹣24.
请你用上述方法解决问题:
(1)已知ab=4,求(2a3b2﹣3a2b+4a)•(﹣2b)的值;
(2)已知x﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf35027e76f8ea593f82023973d4aba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13f40c24c64bbb0645fcf585f4e66872.png)
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【推荐2】已知
的展开式中不含
项和
项,求:
(1)
,
的值;
(2)
的值。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf2f78386325472f010aa06e4179128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d800f03de80068a1172beac3a2c75587.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d511f53749ee93a20908a954e055cfb.png)
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【推荐3】阅读理解:定义:如果一个数的平方等于﹣1,记为
=﹣1,这个数i叫做虚数单位,把形如a+bi(a,b为实数)的数叫做复数,其中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:(2﹣i)+(5+3i)=(2+5)+(﹣1+3)i=7+2i;
(1+i)×(2﹣i)=1×2﹣i+2×i﹣
=2+(﹣1+2)i+1=3+i;
根据以上信息,完成下列问题:
(1)填空:
=_____;
=_____;
= ;
=____.
(2)计算:①
;
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9876a97a68caadd6b177ee250eb229.png)
(3)在复数范围内分解因式:①
_____;
②
_____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819a0b98a210476474e12aa1692b55f9.png)
例如计算:(2﹣i)+(5+3i)=(2+5)+(﹣1+3)i=7+2i;
(1+i)×(2﹣i)=1×2﹣i+2×i﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819a0b98a210476474e12aa1692b55f9.png)
根据以上信息,完成下列问题:
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed9cceee603afe981542717871ad3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80fd9ae5c9fd472f9207ce2c08837c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7aaadc9383e7ccb25286bd557e4da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae9e204b1b6e8184b0e0b69cb308ad4.png)
(2)计算:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb21eea1e132cb1f278fd095060b88d.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9876a97a68caadd6b177ee250eb229.png)
(3)在复数范围内分解因式:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e33a8d47b0084eefdf0ea785dbf407.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103cd19f1ad00c5f4999e60b6a3e56a1.png)
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