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A x b 2 c. Нв 49-12-16. Х2 - 4y = 5, + y = 4.. Y=(Х+3)^2-4. X2-XY-20y2=0.
Нв 49-12-16. Х2 - 4y = 5, + y = 4.. Y=(Х+3)^2-4. X2-XY-20y2=0.

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