Докажите, что для любых множеств A1,A2,...,An,B1,B2,...,Bn а) A1 Δ An ⊂(A1ΔA2)∪(A2ΔA3)∪...∪ (An-1 Δ An) б)(A1 ∩ A2 ∩ ... ∩ An) Δ (B1 ∩ B2 ∩ ... ∩ Bn) ⊂ (A1 Δ B1) ∪ (A2 Δ B2) ∪ ... ∪ (An Δ Bn) |
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