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D( x )
x^5*((25*x^-3*y^4)/125)*y^-3 = 0
x = 0
x^5*((25*x^-3*y^4)/125)*y^-3 = 0
x^5*((25*x^-3*y^4)/125)*y^-3 = 0
1/5*x^2*y = 0 // : 1/5*y
x^2 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^5*((25*x^-3*y^4)/125)*y^-3)^-3 = 0
125*x^-6*y^-3 = 0 // : 125*y^-3
x^-6 = 0
x należy do O
x belongs to the empty set
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