Решение:
$$-12 + 15 = 3$$
$$-33 - 40 = -73$$
$$-18 + (-20) = -18 - 20 = -38$$
$$-11 \times 4 = -44$$
$$-12 \times (-10) = 120$$
$$-125 : (-5) = 25$$
Ответ: 1) 3; 2) -73; 3) -38; 4) -44; 5) 120; 6) 25