1. :
A \ B = A \ (A B) A \ (B C)=(A \ B) (A \ C).
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2. :
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5.
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5.
{ }, { }, {} {}.
6.
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1 ( -).
Ak, k = 1,..., n U, :
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6.
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1.
, .. B.
2. , , = .
3. = . , = N.
4. A C = { 10} = {2, 4, 6, 8, 10}.
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7.
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7.
{ , , \} .