(2m+n)^2-(m-n)^2
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(2m+n)^2-(m-n)^2
(2m+n)^2-(m-n)^2
(2m+n)^2-(m-n)^2
(2m+n)^2-(m-n)^2
=4m²+4mn+n²-(m²-2mn+n²)
=3m²+6mn
=[(2m+n)+(m-n)][(2m+n)-(m-n)]
=3m(m+2n)
4m^2+4mn+n^2-m^2+2mn-n^2=3m^2+2mn
(1),(-m-n)(-m+n) (2),(-m+n)(m-n)
(m-2n)(-m-n)
m-n+2n^2/(m+n)
(m-2n/n-m)-(n/m-n)=
2(m-n)²-m(m-n)
(m-n)(m+n)+(m+n)²-2m²
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