(m-2n-1)(m-2n-1)=?化简
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(m-2n-1)(m-2n-1)=?化简(m-2n-1)(m-2n-1)=?化简(m-2n-1)(m-2n-1)=?化简(m-2n-1)(m-2n-1)=(m-2n)^2-2(m-2n)+1=m^2+
(m-2n-1)(m-2n-1)=?化简
(m-2n-1)(m-2n-1)=?化简
(m-2n-1)(m-2n-1)=?化简
(m-2n-1)(m-2n-1)
=(m-2n)^2-2(m-2n)+1
=m^2+4n^2-4mn-2m+4n+1
(m-2n-1)(m-2n-1)
=[(m-2n)-1]²
=(m-2n)²-2(m-2n)+1
=m²-4mn+4n²-2m+4n+1
(m-2n-1)(m-2n-1)
=(m-2n-1)²
=m²+(-2n)²+(-1)²+2m×(-2n)+2m×(-1)+2×(-2n)×(-1)
=m²+4n²+1-4mn-2m+4n
就是用完全平方公式(a+b+c)²=a²+b²+c²+2ab+2bc+2ca
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