Wykaż równości:
u=suma
^iloczyn
a) (A u B) - A = B - (A ^B)
b) (A ^ B) u (A - B) = A
c) (A c B) <=> (AB-A)
a) b=-a
b) a=a
c) b=b
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a) b=-a
b) a=a
c) b=b