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1.20 x. X2+4x-21 0. 3x^2-x^3=0. X2-x-6 0. 0,4(Х-5)20,5(6+X)-2,5.
X2+4x-21 0. 3x^2-x^3=0. X2-x-6 0. 0,4(Х-5)20,5(6+X)-2,5.

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