Question

упрости вырожение (m+n)(m-n+1)-(m-n)(m+n-1)​

Answer 1

Ответ:

$(m + n)(m - n + 1) - (m - n)(m + n - 1) = {m}^{2} - mn + m + mn - {n}^{2} + n - ( {m}^{2} + mn - m - mn - {n}^{2} + n) = {m}^{2} - mn + m + mn - n^{2} + n - m^{2} + m + {n}^{2} - n = 2m$