(m+n)(m-n)-(1-2n)化简
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(m+n)(m-n)-(1-2n)化简
(m+n)(m-n)-(1-2n)化简
(m+n)(m-n)-(1-2n)化简
应该就是:(m+n)(m-n)-(1-2n) =m²-n²+2n-1 =m²-(n²-2n+1) =m²-(n-1)² =(m-n+1)²
原式=m^2-n^2+2n-1.
(m+n)(m-n)-(1-2n)=m²-(n²-2n+1)=m²-(n-1)²=(m+n-1)(m-n+1)
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