July 2022 1 67 Report
Rezolvati, prin metoda reducerii, urmatoarele sisteme de ecuatii liniare:
a) { 2x - 3y = 7,5
{ 5x + y = -4,1
b) { 6x + 7y = 4
{ -2x + 9y =17
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se considera paralelogramul ABCD de centru O. calculati OA+OB+OC+OD. (OA, OB, OC si OD sunt vectori).
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