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daca a +3b =11 si b +3a=17 aflati nr a si b

Răspuns :

a=11-3b

b+3a=17

b+3(11-3b)=17

b+33-9b=17

-8b +33=17

-8b= 17  -33

-8b= -16

8b=16

b=2

a=11- 3*2=  11-6= 5