5а-(6а-(7а-(8а-9))) срочно

Question

5а-(6а-(7а-(8а-9))) срочно

Answer 1

5a - (6a -(7a - 8a -9)) = 5a - (6a - 7a +8a + 9) = 5a - 6a + 7a - 8a -9 = -2a - 9;
-2a = 9;
a = -(9/2) = -4.5

Comments

Спасиибо