Explicație pas cu pas:
6/(x-1)
x-1∈D{6}
x-1∈{-6,-3,-2,-1,1,2,3,6} |+1
x∈{-5,-2,-1,0,2,3,4,7}=A
(3x+8)/(x+6)
x+6 | 3x+8 (1)
x+6 | x+6 *(3)
x+6 | 3x+18 (2)
Cu (2) si (1) efectuam scaderea
x+6 | 10
x+6∈D{10}
x+6∈{-10,-5,-2,-1,1,2,5,10} |-6
x∈{-16,-11,-8,-7,-5,-4,-1,4}=B
A∩B={-5,-2,-1,0,2,3,4,7}∩{-16,-11,-8,-7,-5,-4,-1,4}={-5,-1,4}
Observam ca -5 apartine
Bafta!