分解因式:(3m+2n)^2-(9m-n)^2

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分解因式:(3m+2n)^2-(9m-n)^2

分解因式:(3m+2n)^2-(9m-n)^2
分解因式:(3m+2n)^2-(9m-n)^2

分解因式:(3m+2n)^2-(9m-n)^2
(3m+2n)^2-(9m-n)^2
=(3m+2n-9m+n)(3m+2n+9m-n)
=(3n-6m)(n+12m)
=3(n-2m)(n+12m)

(3m+2n)^2-(9m-n)^2
=[(3m+2n)-(9m-n)][(3m+2n)+(9m-n)]
=(3n-6m)(12m+n)
=3(n-2m)(12m+n)

用平方差公式a^2-b^2=(a+b)*(a-b)
(3m+2n+9m-n)x(3m+2n-9m+n)然后就可以得出结果了