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