Question

Fie:A={x apartine N stelat|x²≤25} si B={x|x³≤27} aflati:
a)A si B. b)A reunit B,A intersectat B,A-B,B-A

Answer 1

A={0,1,2,3,4,5}
B={0,1,2,3}
A U B= {0,1,2,3,4,5}
A (Aici la intersecție pui U întors) B={0,1,2,3}
A-B={4,5}
B-A={O} (mulțimea viza tai acel o cu o linie \ )

Answer 2

a)
A={1,2,3,4,5}
B={-∞, ......, -3, -2, -1, 0, 1, 2, 3}
b) 
A∪B={-∞, .........., -3,-2,-1,0,1,2,3,4,5}
A∩B={1,2,3}
A-B={4,5}
B-A={-∞,......,-3,-2,-1,0}