Question

Fie multimile :
A={x|x e N si 3x+7$\leq$25}
B={y|y e N, y<7 si 2y$\geq$8}

a) Scrieti elementele fiecarei multimi
b) Calculati A reunit cu B si A intersectat cu B .

Answer 1

a) 3x+7≤25
3x≤≤25-7
3x≤18
x≤18/3
x≤6
A={0,1,2,3,4,5,6}

2y≥8
y≥8/2
B={4,5,6}

b)AUB={0,1,2,3,4,5,6}U{4,5,6}={1,2,3,4,5,6}
AintersectatB={4,5,6}