Question

aflati a,b,c stiind ca a+b =167.b+c=171si c+a=200

Answer 1

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Answer 2

a+b=167⇒a=167-b
b+c=171⇒c=171-b
c+a=200⇒ înlocuim din primele două relații: 171-b+167-b=200⇒338-2b=200⇒-2b=200-338⇒2b=-138/·(-1)⇒2b=138⇒b=138:2=69
a=167-b=167-69=98
c=171-b=171-69=102
verificare:
a+b=98+69=167
b+c=69+102=171
c+a=102+98=200
(este corect)