Răspuns :
varianta 1)
n:85=c*85+81
n:17=c*17+r
r=?
85-81=4
17-4=13
r=13
Varianta 2)
n:85=c+81
n=(85*81)+81
n=6885 +81
n=6966
6966:85=81 rest 81
6966=(85*81)+81
6966=6885+81
6966=6966
6966:17=409 rest 13
6966=(409*17)+13
6966=6953+13
6966=6966
r=13
n:85=c*85+81
n:17=c*17+r
r=?
85-81=4
17-4=13
r=13
Varianta 2)
n:85=c+81
n=(85*81)+81
n=6885 +81
n=6966
6966:85=81 rest 81
6966=(85*81)+81
6966=6885+81
6966=6966
6966:17=409 rest 13
6966=(409*17)+13
6966=6953+13
6966=6966
r=13