[tex]\bold{a)} \ \boxed{100 \ si \ 200}, \ deoarece \ 100:5=20 \ (exact), \ 200:5=40 \ (exact). \\ \bold{b)} \ \boxed{101 \ si \ 103}, \ deoarece \ 101:2=50,5; \ 103:2=51,5. \\ \bold{c)} \ \boxed{205 \ si \ 204}, \ deoarece \ 205:4=51,25; \ 204:4=51,0.
[/tex]