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diferenta-a-doua-nr.-este-390-si-reprezinta-5-pe-8-din-suma-lor.afla-nr?

Răspuns :

a-b=390
(a+b):8x5=390
(a+b):8=390:5
a+b=78x8
a+b=624
a=390+b
390+b+b=624
2b=624-390
2b=234
b=117
a=390+117
a=507