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2. 3/11 * 3 3/10 = 3/11 * 33/10 = 9/10 = 0,9
3. 1/3 * 1 4/5 = 1/3 * 9/5 = 3/5
4. 1/24 * 2 6/7 = 1/24 * 20/7 = 5/42
liczę na naj ;D