3/1*6/4*9/7.3n/(3n-2)>开立方下(3n+1)(3n+2)/2

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3/1*6/4*9/7.3n/(3n-2)>开立方下(3n+1)(3n+2)/23/1*6/4*9/7.3n/(3n-2)>开立方下(3n+1)(3n+2)/23/1*6/4*9/7.3n/(3n-2

3/1*6/4*9/7.3n/(3n-2)>开立方下(3n+1)(3n+2)/2
3/1*6/4*9/7.3n/(3n-2)>开立方下(3n+1)(3n+2)/2

3/1*6/4*9/7.3n/(3n-2)>开立方下(3n+1)(3n+2)/2
直接用归纳法就行了