August 2018 1 21 Report
Wykaż, że:
-jeśli (a-b)^2 + (b-c)^2 + (c-a)^2 = (a+b-2c)^2 + (b+c- 2a)^2 + (c+a-2b)^2, to a=b=c
-jeśli a^2 + b^2 + c^2 = ab + ac + bc , to a=b=c

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