化简:(m-n)(m+n)+(m+n)^2-2m^2

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化简:(m-n)(m+n)+(m+n)^2-2m^2

化简:(m-n)(m+n)+(m+n)^2-2m^2
化简:(m-n)(m+n)+(m+n)^2-2m^2

化简:(m-n)(m+n)+(m+n)^2-2m^2
原式等于(m+n)(m-n+m+n)-2m^2
=(m+n)X2m-2m^2
=2m(m+n-m)
=2mn

(m-n)(m+n)+(m+n)^2-2m^2=(m+n)(m-n+m+n)-2m^2=2m(m+n)-2m^2=2m(m+n-m)=2mn

原式=m²-n²+m²+2mn+n²-2m²=m²+m²-2m²-n²+n²+2mn=2mn

(m-n)(m+n)+(m+n)^2-2m^2
=m^2-n^2+m^2+n^2+2mn-2m^2
=2mn

(m-n)(m+n)+(m+n)^2-2m^2
=m^2-n^2+m^2+2mn+n^2-2m^2
=2mn