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zakładam C = (3; 4>
AuB = A = (-oo; 7>
AnB = B = (3; 7>
A\B = (-oo; 3>
B\A = zbiór pusty
CuD = (3;4> u (10;15>
CnD = zbiór pusty
C\D = C = (3;4>
D\A = D = (10;15>
EuF = E = (-3;12)
EnF = F <5;6)
E\F = (-3;5) u <6;12)
F\E = zbiór pusty