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1.20 x. X^2+3x-4y=20 x^2-2x+y=-5. 4x-5y>20. X2/x-4-x/4-x 20/x-4. X²-20x=20x+100 коротко.
X^2+3x-4y=20 x^2-2x+y=-5. 4x-5y>20. X2/x-4-x/4-x 20/x-4. X²-20x=20x+100 коротко.

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