(31+33)÷8 = 80-9×7+5 = 40-5×8+19 = 9×4+9×6-71 = (42+18)÷6 = (54-46)×9 = (17+46)÷9 = (29+43)÷8 = 50-4×7 = 42-9×3 = 73-8×9 = споеснением