运用乘法公式算(m-2n+3)(m+2n-3)

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运用乘法公式算(m-2n+3)(m+2n-3)

(m-2n+3)(m+2n-3) =[m-(2n-3)]*[m+(2n-3)] =m-(2n-3) = m-4n+12n-9 楼上正解