(m-2n)的平方+(n+2m)的平方

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(m-2n)的平方+(n+2m)的平方(m-2n)的平方+(n+2m)的平方(m-2n)的平方+(n+2m)的平方=[(m-2n)+(n+2m)][(m-2n)-(n+2m)]=(m-2n+n+2m)

(m-2n)的平方+(n+2m)的平方
(m-2n)的平方+(n+2m)的平方

(m-2n)的平方+(n+2m)的平方
=[(m-2n)+(n+2m)][(m-2n)-(n+2m)]
=(m-2n+n+2m)(m-2n-n-2m)
=(3m-n)(-m-3n)
=-(3m-n)(m+3n)

(m-2n)的平方+(n+2m)
=m^2+4n^2-4mn+n^2+4m^2+4mn
=5m^2+5n^2