(m-2n+3)(m+2n-3)计算,
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(m-2n+3)(m+2n-3)计算,(m-2n+3)(m+2n-3)计算,(m-2n+3)(m+2n-3)计算,(m-2n+3)(m+2n-3)=[(m-2n)+3][(m+2n)-3]=(m-2n
(m-2n+3)(m+2n-3)计算,
(m-2n+3)(m+2n-3)计算,
(m-2n+3)(m+2n-3)计算,
(m-2n+3)(m+2n-3)
=[(m-2n)+3][(m+2n)-3]
=(m-2n)^2-3^2
=m^2-4mn+4n^2-9
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