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D( x )
5*x^(4/5) = 0
5*x^(4/5) = 0
5*x^(4/5) = 0
5*x^(4/5) = 0 // : 5
x^(4/5) = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*ln(2))/(5*x^(4/5)) = 0
((4*ln(2))/5)*x^(-4/5) = 0 // : (4*ln(2))/5
x^(-4/5) = 0
x naleu017Cy do O
x belongs to the empty set
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