Daca x+y=5² si x · y=2, aflati x²+y² si x-y
Daca x²+y²=21 si x+y=5, aflati x-y si x·y
Daca x-2y=0, aflati 2x²-3xy+2y²
Daca 2x=3y, aflati 4x-6y+2 si 2x/y -3
Daca imi puteti da si cateva explicatii ar fi foarte bine. Multumesc

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2014-03-25T17:27:31+02:00

x^{2} + y ^{2}  =(x+y) ^{2} -2xyx^{2} + y ^{2} =625-2