(3n-2)(3n+1)(3n+4)(3n+7)+81怎样分解因式

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(3n-2)(3n+1)(3n+4)(3n+7)+81怎样分解因式(3n-2)(3n+1)(3n+4)(3n+7)+81怎样分解因式(3n-2)(3n+1)(3n+4)(3n+7)+81怎样分解因式(

(3n-2)(3n+1)(3n+4)(3n+7)+81怎样分解因式
(3n-2)(3n+1)(3n+4)(3n+7)+81怎样分解因式

(3n-2)(3n+1)(3n+4)(3n+7)+81怎样分解因式
(3n-2)(3n+1)(3n+4)(3n+7)+81
=(3n-2)(3n+7)(3n+1)(3n+4)+81
=(9n²+15n-14)(9n²+15n+4)+81
=(9n²+15n-5-9)(9n²+15n-5+9)+81
=(9n²+15n-5)²-9²+81
=(9n²+15n-5)²