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Calculraz 11a+2b+c=4030 stiind .ca a+b=690 si b+c=1040

Răspuns :

11a+2b+c=4030
a+b=690
b+c=1040
Atunci inlocuim in prima ecuatie
10a+690+1040=4030
10a=4030-690-1040
10a=2300
a=2300÷10
a=230
230+b =690
b=460
460+c=1040
c=580