December 2018 1 8 Report
Wykaż że :
a) jeśli c ≠ 0 i (a+b-c)^2 = a^2 + b^2 +c^2 +2ab to a = -b
b) jeśli b ≠ c i (a-b+c)^2 = a^2 + c^2 - 2ab +2ac to b=2c
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