(3m-2n+2)(3m+2n+2)
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(3m-2n+2)(3m+2n+2)(3m-2n+2)(3m+2n+2)(3m-2n+2)(3m+2n+2)=(（3m+2)-2n)((3m+2)+2n)用平方差公式=(3m+2)²-4n&
(3m-2n+2)(3m+2n+2)
(3m-2n+2)(3m+2n+2)
(3m-2n+2)(3m+2n+2)
=(（3m+2)-2n)((3m+2)+2n)
用平方差公式=(3m+2)²-4n²
用完全平方公式=9m²+12m+4-4n²
这样还不够详细,就恕我无奈了
(3m-2n+2)(3m+2n+2)=[(3m+2)-2n][(3m+2)+2n]=(3m+2)^2-4n^2=9m^2+4+12m-4n^2
回答完毕
(3m-2n+2)(3m+2n+2)
=[(3m+2)-2n]x[(3m+2)+2n]
=(3m+2)^2-(2n)^2
=9m^2+12m+4-4n ^2
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