(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](/uploads/image/z/8083963-19-3.jpg?t=%283m%2B2n%2B2%29%282-3m-2n%29%E6%96%B9%E6%B3%95%E6%AD%A5%E9%AA%A4)
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
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