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a +b=60 . b+c=69 a+c=55 . Afla nr


Răspuns :

a=60-b
c=69-b
60-b+69-b=55
-2b=-74
b=37
a=23
c=32
a+b+b+c+a+c=184
2a+2b+2c=184
2 (a+b+c)=184
a+b+c=184:2=92
60+c=92
c=32, b=37, a=23