Верны ли утверждения: а) A∩B=A∪B⇔A=B. б) A∩C=B∩C⇔A=B. в) A∪C=B∪C⇔A=B. г) A\C=B\C⇔A=B. д) AΔC=BΔC⇔A=B. е) A\B⊂(A\C)∪(B\C) ж) AΔB⊂(AΔC)∪(BΔC). з) A∩B∩C⊂AΔBΔC. |
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