m³-m²n-mn²+n³ = (m³ + n³)-(m²n+mn²)=(m+n)×(m²-mn+n²) -mn×(m+n)=
= (m+n)×(m²-mn+n²-mn) = (m+n)×(m²-2mn+n²)=(m+n)×(m-n)²=
=(m+n)×(m-n)×(m-n)
m³-m²n-mn²+n³ = (m³ + n³)-(m²n+mn²)=(m+n)×(m²-mn+n²) -mn×(m+n)=
= (m+n)×(m²-mn+n²-mn) = (m+n)×(m²-2mn+n²)=(m+n)×(m-n)²=
=(m+n)×(m-n)×(m-n)