a) 45 x (347 - 198) - 1,786 = 45 x 149 - 1,786 = 6,705 - 1,786 = 4,919
b) (70 + 5 x 6 - 48 ÷ 3 ÷ 4 - 89) + 56 ÷ 8 = (70 + 5 x 6 - 16 ÷ 4 - 89) + 7 = (70 + 30 - 4 - 89) + 7 = 7 + 7 = 14
c) (91 - 6 x 7) ÷ (41 + 18 ÷ 6 - 37) = (91 - 42) ÷ (41 + 3 - 37) = 49 ÷ 7 = 7
d) [5 ÷ (2³ - 1) + 14] ÷ 15 + 3 ÷ [1 + 2 x (45 ÷ 15 - 2)] = [5 ÷ (8 - 1) + 14] ÷ 15 + 3 ÷ [1 + 2 x (3 - 2)] = [5 ÷ 7 + 14] ÷ 15 + 3 ÷ [1 + 2 x 1] = [0.71 + 14] ÷ 15 + 3 ÷ [1 + 2] = 14.71 ÷ 15 + 3 ÷ 3 = 0.98 + 1 = 1.98
e) 2,220 x [(5 x 105 - 30) ÷ 3 - 65] = 2,220 x [(525 - 30) ÷ 3 - 65] = 2,220 x [495 ÷ 3 - 65] = 2,220 x [165 - 65] = 2,220 x 100 = 222,000