Răspuns:
Explicație pas cu pas:
6/(x+1)∈N x+1=1 si x+1=2 x+1=3 x+1=6
x+1=1 x=0
x+1=2 x=1
x+1=3 x=2
x+1=6 x=5 S={0,1,2,5}
17 / (43x+2)∈N
43x+2=1 43x=-1∉N
43x+2=17 43x=15 ∉N
18/(2x-3)∈N 2x-3=1 x=`1
2x-3=2 x∉N
2x-3=3 x=3
2x-3=6 x∉N
2x-3=9 x=4
2x-3=18 x∉N
S={1,3,4}
5/( x-1)∈N x-1=1 x=0
x-1=5 x=6
S={0,6}