Question

ayudaaa es urgente por favor!!!​

Answer 1

Respuesta:

$3m^2-3mn+\left(\left(m^2-mn\right)+n^2\right)\\\\\\3m^2-3mn+m^2-mn+n^2\\\\\\3m^2+m^2-3mn-mn+n^2\\\\\\4m^2-3mn-mn+n^2\\\\\\4m^2-4mn+n^2$