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a = 1/9 : 7/2 - 1/2*1/2
a = 1/9 * 2/7 - 1/4
a = 2/63 - 1/4
a = 8/252 - 63/256
a = - 55/256
liczba odwrotna do a to - 256/55 = - 4 32/256 = -4 32/55