Question

1) determinaţi X apartine N, X< 10 astfel incat 5| (15+x)
2) determinaţi X apartine N, X<20, astfel incat 3|(27-x)

Answer 1

1. 5/(15+x) deci u(15+x)=0 sau 5
x=5

2. 3/(27-x)
x={0; 3; 6; 9; 12; 15; 18}