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2. (13 1/4 - 2 1/2) * 9/10 = 15 3/4 * 9/10 = 567/40 =14 7/40
3. 2 1/4 * (5,88-1,44) = 2,25 * 4,44 = 9,99
4. (3/8 - 1/5) : 7/500 = (0,375 - 0,2) : 0,014 = 0,175 : 0,014 = 12,5