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D( x )
(1/5)*x^5*y^-4 = 0
(1/5)*x^5*y^-4 = 0
(1/5)*x^5*y^-4 = 0
1/5*x^5*y^-4 = 0 // : 1/5*y^-4
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
((1/5)*x^5*y^-4)^-2 = 0
25*x^-10*y^8 = 0 // : 25*y^8
x^-10 = 0
x naleu017Cy do O
x belongs to the empty set
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