Răspuns :
a+b+c=154
b=a+18 ⇒ a=b-18
b=c-13 ⇒ c= b+13
Ne ducem in prima ecuatie
b-18+b+b+13=154
3×b = 154+5
3×b = 159
b=159 : 3 = 53
a=53-18= 35
c=66
b=a+18 ⇒ a=b-18
b=c-13 ⇒ c= b+13
Ne ducem in prima ecuatie
b-18+b+b+13=154
3×b = 154+5
3×b = 159
b=159 : 3 = 53
a=53-18= 35
c=66
a.I____I
b.I____I18I
c.I____I18I13I
Suma este 154 .
154-49=105 suma partilor egale
105:3=35 ( nr, a )
35+18=53 ( nr.b )
35+18+13=66 ( nr.c )
Verificare : 66+53+35=154
b.I____I18I
c.I____I18I13I
Suma este 154 .
154-49=105 suma partilor egale
105:3=35 ( nr, a )
35+18=53 ( nr.b )
35+18+13=66 ( nr.c )
Verificare : 66+53+35=154