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D( x )
x < 0
x^2.5 = 0
x < 0
x^2.5 = 0
x^2.5 = 0
1*x^2.5 = 0 // : 1
x^2.5 = 0
x = 0
x in (0:+oo)
4/(x^2.5) = 0
4*x^-2.5 = 0 // : 4
x^-2.5 = 0
x należy do O
x belongs to the empty set
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