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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-((2/2)*x^2)-x-(2/x) = 0
x-x^2-x-2*x^-1 = 0
-x^2-2*x^-1 = 0
-x^-1*(x^3+2) = 0
1*x^3 = -2 // : 1
x^3 = -2
x^3 = -2 // ^ 1/3
x = -2^(1/3)
-1/x = 0
-1*x^-1 = 0 // : -1
x^-1 = 0
x naleu017Cy do O
x = -2^(1/3)
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