Ответ:
- \(2a^2-4ab+2b^2=2(a-b)^2\);
- \(x^2-y^2+x+y=(x+y)(x-y+1)\);
- \(5m^2+20mn+20n^2=5(m+2n)^2\);
- \(x^3+x^2y-xy^2-y^3=(x+y)(x^2-y^2)=(x-y)(x+y)^2\);
- \((a-b)^3-3(a^2-b^2)=(a-b)^3-3(a-b)(a+b)=(a-b)(a^2-2ab+b^2-3a-3b)\);
- \((m+n)^3-n(m+n)^2=(m+n)^2((m+n)-n)=m(m+n)^2\).
