Ответ:
4mn-9n^2-m^2
Объяснение:
m*n+m*2n -3n*n-3n*2n -m*m+m*n = mn+2mn-3n^2-6n^2-m^2+mn = 4mn-9n^2-m^2
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Ответ:
4mn-9n^2-m^2
Объяснение:
m*n+m*2n -3n*n-3n*2n -m*m+m*n = mn+2mn-3n^2-6n^2-m^2+mn = 4mn-9n^2-m^2