计算(m-n+9)(m+n-9)

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计算(m-n+9)(m+n-9)计算(m-n+9)(m+n-9)计算(m-n+9)(m+n-9)解(m-n+9)(m+n-9)=[m-(n-9)][m+(n-9)]=m²-(n-9)

计算(m-n+9)(m+n-9)
计算(m-n+9)(m+n-9)

计算(m-n+9)(m+n-9)

(m-n+9)(m+n-9)
=[m-(n-9)][m+(n-9)]
=m²-(n-9)²
=m²-n²+18n-81