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A+B+C=290 !A÷C=3. A-B=50

Răspuns :

a=3c
b=a-50=3c-50
Inlocuim
3c+(3c-50)+c=290
4c+3c-50=290
7c=290+50=340
c=48,(571428)
a=145,(714285)
b=95,(714285)