Question

VA ROG REPEDE DAU COROANA LA CEL MAI BUN RASPUNS Aflati AUB ,A ∩ B ,A\B, B\A daca:
a)A={-2,-5,3,7,9},B={-5,3,7,9}
b)A={a,b,m,n},B={b,c,d,m,n,t}
c)A={x|x∈Z,|x|<7},B={x|x∈Z,|x|>2}
d)A=N,B=Z

Answer 1

a) A U B={-2,-5,3,7,9}
A ∩ B={-5,3,7,9}
A\B={-2}
B\A=Ф

b)AUB={a,b,c,d,m,n,t}
A ∩ B={b,m,n}
A\B={a}
B\A={c,d,t}

c) A={ -6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6}
B=Z \ {-2,-1,0,1,2}

AUB=Z
A ∩ B={-6,-5,-4,-3,3,4,5,6}
A\B={-2,-1,0,1,2}
B\A=Z\{-6,-5,-4,-3,3,4,5,6}

d) AUB=Z
A ∩ B=N
A\B=Ф
B\A={-1,-2,-3...., -∞}