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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/3)*x^2+6/x = 0
5/3*x^2+6*x^-1 = 0
x^-1*(5/3*x^3+6) = 0
5/3*x^3 = -6 // : 5/3
x^3 = -18/5
x^3 = -18/5 // ^ 1/3
x = -(18/5)^(1/3)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x = -(18/5)^(1/3)
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