Question

математика помогите

Answer 1

a

$n + (n + 3) + (n + 6) = n + n + 3 + n + 6 = 3n + 9$

$(n - 3) + (n - 1) + (n + 1) = n - 3 + n - 1 + n + 1 = 3n - 3$

$(n - 10) + (n - 5) + n + (n + 5) = n - 10 + n - 5 + n + n + 5 = 4n - 10$

б

$(p - 5) - (p + 5) = p - 5 - p - 5 = - 10$

$(p + 5) - (p - 5) = p + 5 - p + 5 = 10$

$p - (p - 5) + (p + 5) = p - p + 5 + p + 5 = p + 10$