探索规律
观察下列各式及验证过程:n=2时有式①:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000756704442860/SYS201311030007567044428020_ST/0.png)
n=3时有式②:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000756704442860/SYS201311030007567044428020_ST/1.png)
式①验证:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000756704442860/SYS201311030007567044428020_ST/2.png)
式②验证:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000756704442860/SYS201311030007567044428020_ST/3.png)
(1)针对上述式①、式②的规律,请写出n=4时的式子;
(2)请写出满足上述规律的用n(n为任意自然数,且n≥2)表示的等式,并加以验证.
考点分析:
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