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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/6)*x^2+1/x = (1/2)*x^2 // - (1/2)*x^2
(1/6)*x^2-((1/2)*x^2)+1/x = 0
(1/6)*x^2+(-1/2)*x^2+1/x = 0
x^-1-1/3*x^2 = 0
x^-1*(1-1/3*x^3) = 0
-1/3*x^3 = -1 // : -1/3
x^3 = 3
x^3 = 3 // ^ 1/3
x = 3^(1/3)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x = 3^(1/3)
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