Question

fie multimile:A={x |x €N si 3x+7≤25} si B={y | y €N,y<7 si 2y≥8} a) scrieti elementele fiecarei multimi. b)calculati A u B si A n B. VA ROG

Answer 1

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
y≥4
y<7
y∈[4,7)
B={4,5,6}
b) AUB={0,1,2,3,4,5,6|
AnB={4,5,6}