Question

Se dau multimile:
A={x|x∈N si x+1 divizor al lui 18}
B={x|x ∈ Nsi x-2 divizor al lui 15}

Answer 1

D18={1,2,3,6,9,18}
x+1=1=>x=0∈N
x+1=2=>x=1∈N
x+1=3=>x=2∈N
x+1=6=>x=5∈N
x+1=9=>x=8N∈
x+1=18=>x=17∈N
A={0,1,2,5,8,17}

D15={1,3,5,15}
X-2=1⇒X=3∈N
X-2=3⇒X=5∈N
X-2=5⇒X=7∈N
X-2=15⇒X=17∈N
B={3,5,7,17}