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D( x )
(x^-1*y^-2*z)^3 = 0
x^2*y^5*z^-2 = 0
x = 0
(x^-1*y^-2*z)^3 = 0
(x^-1*y^-2*z)^3 = 0
x^-3*y^-6*z^3 = 0 // : y^-6*z^3
x^-3 = 0
x naleu017Cy do O
x^2*y^5*z^-2 = 0
x^2*y^5*z^-2 = 0
x^2*y^5*z^-2 = 0 // : y^5*z^-2
x^2 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^2*y^5*z^-2)^-2)/((x^-1*y^-2*z)^3) = 0
x^-1*y^-4*z = 0 // : y^-4*z
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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