(3m+2n+2)(2-3m-2n)方法步骤

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(3m+2n+2)(2-3m-2n)方法步骤(3m+2n+2)(2-3m-2n)方法步骤(3m+2n+2)(2-3m-2n)方法步骤用平方差公式,(3n+2n+2)(2-3m-2n)=((2+(3m+

(3m+2n+2)(2-3m-2n)方法步骤
(3m+2n+2)(2-3m-2n)方法步骤

(3m+2n+2)(2-3m-2n)方法步骤
用平方差公式,(3n+2n+2)(2-3m-2n)=((2+(3m+2n))(2-(3m+2n))=4-(3m+2n)^2=4-9m^2-12mn-4n^2