计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e38775c93f3940ed242ce1d9f57b387.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e38775c93f3940ed242ce1d9f57b387.png)
更新时间:2023-01-05 08:43:50
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填空题-双空题
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容易
(0.94)
解题方法
【推荐1】如图,在平面直角坐标系中的一系列格点
,其中
,且
,
.记
,如
记为
,
记为
,
记为
……依此类推.设数列
的前
项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5eb9b8f893dd71876349ad40724550.png)
______________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2778e2dadff4d91102e6046bb5def8.png)
______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f70db67d96a5bf6d5c6b93ed64952d7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/796d2645ff431d92de68c06bc7fce212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e92b8041e98e4f435acdbeb983efbe46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2280277323db7183727f887dcd6e9e.png)
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您最近一年使用:0次
填空题-单空题
|
容易
(0.94)
【推荐2】在等差数列
中,
,则
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=______________ .
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/d2b6fc9311454dbeb95a368cd257b1c8.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/c64e74c195e3403d9ebb8454a4cbdea7.png?resizew=84)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/d2b6fc9311454dbeb95a368cd257b1c8.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/f0e576d4a8824665a7f90163023dcb27.png?resizew=19)
您最近一年使用:0次
填空题-单空题
|
容易
(0.94)
解题方法
【推荐2】写出一个复数z,使得z在复平面内对应的点位于第三象限,但
在复平面内对应的点位于第一象限,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d67321ace1e6b3be0fc0e5e8130022.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ea3cc01ce7266cdf0fd73fd50d23c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d67321ace1e6b3be0fc0e5e8130022.png)
您最近一年使用:0次