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D( x )
x < 0
x^2*y^-1.5 = 0
(7*x^1.5*y^5)/(x^2*y^-1.5) = 0
x < 0
x^2*y^-1.5 = 0
x^2*y^-1.5 = 0
x^2*y^-1.5 = 0 // : y^-1.5
x^2 = 0
x = 0
(7*x^1.5*y^5)/(x^2*y^-1.5) = 0
(7*x^1.5*y^5)/(x^2*y^-1.5) = 0
7*x^-0.5*y^6.5 = 0 // : 7*y^6.5
x^-0.5 = 0
x należy do O
x in (0:+oo)
((7*x^1.5*y^5)/(x^2*y^-1.5))^-2 = 0
1/49*x*y^-13 = 0 // : 1/49*y^-13
x = 0
x in { 0}
x belongs to the empty set
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