№3. Сосчитай: 9 + 4; 9 − 4; 5 − 2; 8 + 4; 12 − 6; 3 + 6; 13 − 10; 1 + 10; 11 − 5.

\(9 + 4 = \mathbf{13}\)

\(9 - 4 = \mathbf{5}\)

\(5 - 2 = \mathbf{3}\)

\(8 + 4 = \mathbf{12}\)

\(12 - 6 = \mathbf{6}\)

\(3 + 6 = \mathbf{9}\)

\(13 - 10 = \mathbf{3}\)

\(1 + 10 = \mathbf{11}\)

\(11 - 5 = \mathbf{6}\)

Ответ: 13, 5, 3, 12, 6, 9, 3, 11, 6.