3.29. Функции y = f(x) и y = g(x) заданы таблицами. Найдите: 1) φ(3), φ(1), если φ(x) = f(x) + g(x); 2) r(2) и r(4), если r(x) = f(x) · g(x).

По таблицам: f(3) = 1, g(3) = 9; f(1) = 5, g(1) = 1; f(2) = 3, g(2) = 4; f(4) = −1, g(4) = 16.

1. φ(3) = f(3) + g(3) = 1 + 9 = 10; φ(1) = f(1) + g(1) = 5 + 1 = 6.
2. r(2) = f(2) · g(2) = 3 · 4 = 12; r(4) = f(4) · g(4) = (−1) · 16 = −16.

Ответ: φ(3) = 10, φ(1) = 6, r(2) = 12, r(4) = −16.