Упростите ворожения (3m²+3n²)-(2m+n)×(m+2n)

Question

Упростите ворожения
(3m²+3n²)-(2m+n)×(m+2n)

Answer 1

3m^2+3n^2-(2m^2+2n^2)=3m^2+3n^2-2m^2-2n^2=m^2+n^2

Comments

чего

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^2-в квадрате