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2.niech:
A={x:x ∈ N ∧ x ≤ - 3 ∨ x >4}={5,6,7,8,9,...}
B={x:x ∈ N ∧ |7-2x|≤5}
7-2x≤5→-2x≤-2→x≥1
-5≤7-2x→2x≤12→x≤6
x∈<1,6>∧x∈N→x={1,2,3,4,5,6}
wyznacz:
AuB={1,2,3,4,5,6,7,8,9,10,...}
AnB={5,6}
A\B={7,8,9,10,...}
B\A ={1,2,3,4}