Question

Fie multimile :
A={x|x∈Z, |x| mai mic 9}
B={x|x∈Z, -5 mai mic x≤8}
Aflati AUB,A u invers B, A\B, B/A

Answer 1

-9 < x< 9 ⇒ x∈ {-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8} 
A= {-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8} 
B= {-4,-3,-2,-1,0,1,2,3,4,5,6,7,8}
 AUB= {-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8} 
A intersectat B={-4,-3,-2,-1,0,1,2,3,4,5,6,7,8}
A-B= {-8,-7,-6,-5}
B-A=Ф multimea vida