1.a.I____I____I____I____I____I____I____I18I
b.I____I......................144..............................I
144-18=126
126:6=21 (b)
21x7+18=165 (a)
Verificare : 165-21=144
2.a.I____I____I
b.I____I
c.I____I____I____I+13
Suma este 739 . Aflam suma partilor egale :
739-13=726
726:6=121 ( numarul b )
121x2=242 ( numarul a )
121x3+13=376 ( numarul c )
Verificare : 121+242+376=739