观察下列等式
,
,
,
将以上三个等式两边分别相加得:
.
(1)猜想并写出:![](https://img.xkw.com/dksih/QBM/2012/8/22/1577488843603968/1577488845185024/STEM/e8146cf09d664d729debaca4c5336003.png)
(2)直接写出下列各式的计算结果:
①![](https://img.xkw.com/dksih/QBM/2012/8/22/1577488843603968/1577488845185024/STEM/60d68d19192a43508c02c06f8761aaad.png)
②![](https://img.xkw.com/dksih/QBM/2012/8/22/1577488843603968/1577488845185024/STEM/46e42057a7df4f528f6597844dd5e434.png)
(3)探究并计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86263ae3cf1a8b5a7bb6435be0b3ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36e2eae926d9a2838f5464fb00d256f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26df0b7195172c573865438e35989c1.png)
将以上三个等式两边分别相加得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfd567c76c8aadfb19bde231637ffec.png)
(1)猜想并写出:
![](https://img.xkw.com/dksih/QBM/2012/8/22/1577488843603968/1577488845185024/STEM/e8146cf09d664d729debaca4c5336003.png)
(2)直接写出下列各式的计算结果:
①
![](https://img.xkw.com/dksih/QBM/2012/8/22/1577488843603968/1577488845185024/STEM/60d68d19192a43508c02c06f8761aaad.png)
②
![](https://img.xkw.com/dksih/QBM/2012/8/22/1577488843603968/1577488845185024/STEM/46e42057a7df4f528f6597844dd5e434.png)
(3)探究并计算:
![](https://img.xkw.com/dksih/QBM/2012/8/22/1577488843603968/1577488845185024/STEM/48887e02cc2a4afaacd7116f4adc8c71.png)
11-12七年级上·湖北孝感·期中 查看更多[2]
更新时间:2019-01-30 18:14:09
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相似题推荐
解答题-计算题
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适中
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名校
【推荐1】探索规律:
(1)计算:
①
_________,
_________;
②
________,
________.
(2)归纳:由(1)的计算可得
________.
(3)利用(2)探索出的规律,解答下题.
若
与
互为相反数,求x的值.
(1)计算:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddd60157d6b3fdb530793a9bd50cadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902420dc24545a3b1b8bbb4dbbb938de.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4b9f0206c22ce1fddfee8a6fecde21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa67ef06e8a3348aa2869d61b285ee4d.png)
(2)归纳:由(1)的计算可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30ed535b68d9e3a727bc81d728d5272.png)
(3)利用(2)探索出的规律,解答下题.
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5115c2680b31e74efd37eb0f74897a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/487f2605bbe7e4b59e39b760c9c85b8b.png)
您最近一年使用:0次
解答题-计算题
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适中
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【推荐2】仔细观察下列等式:
第1个:
;
第2个:
;
第3个:
;
第4个:
;
(1)请你写出第8个等式:______;
(2)请写出第n个等式,并加以验证;
(3)运用上述规律,计算:
.
第1个:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0b9da574079677a11cf49bda7f9532.png)
第2个:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2869587cdbf7093d1aef256acd717ff.png)
第3个:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22569c4f899112b97a835ed03174d25d.png)
第4个:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a819804dc4b63278f04c13d32dc95397.png)
(1)请你写出第8个等式:______;
(2)请写出第n个等式,并加以验证;
(3)运用上述规律,计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ec674901988476db84c2d6ed4ab138.png)
您最近一年使用:0次
解答题-计算题
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【推荐3】阅读理解题:定义:如果一个数的平方等于-1,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+bi(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:
(3+5i)+(2-3i)=(3+2)+(5-3)i=5+2i,
(1+i)×(2-i)=1×2-1×i+i×2-
=2-i+2i+1=3+(-1+2)i=3+i,
(1)填空:
= ,
= ;
(2)计算:(3+2i)×(1-i);
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73be79c02db553929619d957187e2077.png)
(3+5i)+(2-3i)=(3+2)+(5-3)i=5+2i,
(1+i)×(2-i)=1×2-1×i+i×2-
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819a0b98a210476474e12aa1692b55f9.png)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed9cceee603afe981542717871ad3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80fd9ae5c9fd472f9207ce2c08837c7.png)
(2)计算:(3+2i)×(1-i);
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11efe069542d9721fe2bda1b79679441.png)
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