Ответ:(26 + m) + 34 = m + (26 + 34) = m + 60.235 + (565 + n) = (235 + 565) + n = 800 + n.412 + k + 158 = (412 + 158) + k = k + 570.1 353 + 2 097 + p = 3 450 + p = 3 450 + p.