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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((5/3)*x^2)/3-(((10/3)*x^-1)/3) = 0
((5/3)*x^2)/3+(-10/9)*x^-1 = 0
5/9*x^2-10/9*x^-1 = 0
5/9*x^-1*(x^3-2) = 0
1*x^3 = 2 // : 1
x^3 = 2
x^3 = 2 // ^ 1/3
x = 2^(1/3)
5/(9*x) = 0
5/9*x^-1 = 0 // : 5/9
x^-1 = 0
x należy do O
x = 2^(1/3)
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