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a+b =641,b+c=685,a+c=506.Cat este a?Dar b?Dar c?

Răspuns :

a+b=641
a=641-b
b+c=685
c=685-b
a+c=506
641-b+685-b=506
-b-b=506-641-685
-2b=-820 |:(-2)
b=410
a=641-b
a=641-410
a=231
c=685-b
c=685-410
c=275