тут ФСУ (x-2)^2+4=x^2-4x+8
y=x^2-4x+8
(a-b)^2=a^2-2ab+b^2
(x-2)^2=x^2-4x+4
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тут ФСУ (x-2)^2+4=x^2-4x+8
y=x^2-4x+8
(a-b)^2=a^2-2ab+b^2
(x-2)^2=x^2-4x+4