Răspuns:
Explicație pas cu pas:
Notam :
|,,,,,,,,,,,,,|= numarul care se scade
|,,,,,,,,,,,,,| +9
|,,,,,,,,,,,,,| +15
|,,,,,,,,,,,,,| +11
|,,,,,,,,,,,,,| +12
------------------------------------- (+)
4*|,,,,,,,,,,,,,| +9+15+11+12 = 67
4*|,,,,,,,,,,,,,| = 67 -9-15-11-12
4*|,,,,,,,,,,,,,| =20
|,,,,,,,,,,,,,| =5
Numerele sunt :
5+9=14
5+15=20
5+11=16
5+12= 17
Verificare : 14+20+16+17=67