a) 2|1x (barat) =>x trebuie sa fie cifra para; convine doar x=8.
b) 5|4x (barat) =>x ∈{0,5}. Convine doar x=5.
c) x=8
d) 7| 1x2 (barat) => x∈{1,8} . Convine doar x=1
e) 9| 1xx (barat) => 9|1+2x => x=4
f) [tex] \sqrt{ \frac{1x (barat)}{3} } [/tex] ∈ R-Q => x∈{0,1,3,4,5,6,7,8,9}
