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1,6 * 2 3/4 = 1 3/5 * 2 3/4 = 8/5 * 11/4 = 88/20 = 4 8/20 = 4 2/5
3 1/2 * 2,5 = 7/2 * 5/2 = 35/4 = 8 3/4
3,125 / 1 1/4 = 3 1/8 / 5/4 = 25/8 / 5/4 = 25/8 * 4/5 = 100/40 = 10/4 = 2 1/2
(2 3/5 - 0,6 + 0,75) * 2 = (2,6 - 0,6 + 0,75) * 2 = 2,75 * 2 = 4 + 1,5 = 5,5
1 1/4 * 2/3 / 1 2/3 = 5/4 * 2/3 / 5/3 = 10/12 * 3/5 = 30/60 = 1/2