oblicz
1 i 2/7 + 1 i 4/10 = 9/7 * 14/10 = 9/1 * 2/10 = 18/10 = 9/5 = 1 i 4/5
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1 i 2/7 + 1 i 4/10 = 9/7 * 14/10 = 9/1 * 2/10 = 18/10 = 9/5 = 1 i 4/5