(6 * 8) * 5 = 6 * (8 * 5) = 6 * 40 = 240
5 * (2 * 7) = (5 * 2) * 7 = 10 * 7 = 70
3 * (4 * 5) = 3 * 20 = 60
100 * (3 * 7) = 100 * 21 = 2 100
(20 * 5) * 6 = 100 * 6 = 600
(60 * 5) * 4 = 60 * (5 * 4) = 60 * 20 = 1 200
(30 * 6) * 10 = (30 * 10) * 6 = 300 * 6 = 1 800
20 * (50 * 7) = (20 * 50) * 7 = 1 000 * 7 = 7 000
