Răspuns :
a+b+c=439
a+b=334
b=2c
334+c=439
c=439-334
c=105
b=2x105
b=210
a+210=334
a=334-210
a=124
Verificare : 124+210+105=439
a+b=334
b=2c
334+c=439
c=439-334
c=105
b=2x105
b=210
a+210=334
a=334-210
a=124
Verificare : 124+210+105=439
a+b+c=439;a+b=334inlocuim 334+c=439;c=439-334;c=105;b=2x105;b=210;inlocuim pe csi b si avem:a+210+105=439;a=439-210-105;a=124;v:124+210+105=439