题型:解答题-证明题
难度:0.85
引用次数:594
题号:6197755
观察下列各式:①
,②
;③
,…
(1)请观察规律,并写出第④个等式: ;
(2)请用含n(n≥1)的式子写出你猜想的规律: ;
(3)请证明(2)中的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e651d23dd38f769a9bffd3d6e4bf5dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ad1ab457736bf163b7a9a4720e4b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7e357507316f2cf8ea76ab66a5e9d2.png)
(1)请观察规律,并写出第④个等式: ;
(2)请用含n(n≥1)的式子写出你猜想的规律: ;
(3)请证明(2)中的结论.
更新时间:2018-03-21 09:42:07
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【知识点】 与实数运算相关的规律题
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【推荐1】观察下列各式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f228660c492df2f4b9c96091fb7806e4.png)
(1)类比上述式子,猜想
__________;
__________.
(2)计算
,写出推导过程;
(3)观察上述式子的规律,请用n(
)表示这一规律,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f228660c492df2f4b9c96091fb7806e4.png)
(1)类比上述式子,猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47cfb07f1ba9c28ce33acb4eae04ff4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f538e437a2bb288e00b3014e7a0ebe16.png)
(2)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6b3d787531fb0e502c6287c4b1ee05.png)
(3)观察上述式子的规律,请用n(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e167b43045b3297248e334c41c621b8f.png)
您最近一年使用:0次
解答题-证明题
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【推荐2】观察下列算式:
第1个式子:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2331c095b65a5a8e9c4a995c2a27f673.png)
第2个式子:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28138b028e1eb1ccd2e4903b66d945de.png)
第3个式子:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c75b5c538ca1e8068be736b212a463.png)
第4个式子:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71bf0bba38cf188d420977e1273c4a8.png)
(1)猜想第5个等式为___________;
(2)探索规律:若字母
表示自然数,请写出第
个等式;
(3)试证明你写出的等式的正确性.
第1个式子:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2331c095b65a5a8e9c4a995c2a27f673.png)
第2个式子:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28138b028e1eb1ccd2e4903b66d945de.png)
第3个式子:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c75b5c538ca1e8068be736b212a463.png)
第4个式子:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71bf0bba38cf188d420977e1273c4a8.png)
(1)猜想第5个等式为___________;
(2)探索规律:若字母
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)试证明你写出的等式的正确性.
您最近一年使用:0次