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D( x )
100*x^5 = 0
100*x^5 = 0
100*x^5 = 0
100*x^5 = 0 // : 100
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*x^4)/(100*x^5) = 0
1/10*x^-1 = 0 // : 1/10
x^-1 = 0
x należy do O
x belongs to the empty set
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