Răspuns :
a-b=144
a:b=7.18
D=cxI+R
a=7xb+18
7xb+18-b=144
6xb+18=144
6xb=144-18
6xb=126
b=126:6
b=21
a-21=144
a=144+21
a=165
a:b=7.18
D=cxI+R
a=7xb+18
7xb+18-b=144
6xb+18=144
6xb=144-18
6xb=126
b=126:6
b=21
a-21=144
a=144+21
a=165
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
b.I____I......................144..............................I
144-18=126
126:6=21 (b)
21x7+18=165 (a)
Verificare : 165-21=144