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L = (5 1/3 - 0,8) * 1 1/2 = (16/3 - 8/10) * 3/2 = (160/30 - 24/30) * 3/2 = 136/30 * 3/2 = 68/10 = 6 4/5
M = 0,625 + 1 1/2 * 0,4 = 5/8 + 3/2 * 2/5 = 5/8 + 3/5 = 25/40 + 24/40 = 49/40 = 1 9/40
= L/M = (6 4/5) / 1 9/40 = 68/10 * 40/49 = 272 / 49 = 5 27/49