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D( x )
25*x <= 0
25*x <= 0
25*x <= 0
25*x+0 <= 0 // - 0
25*x <= 0 // : 25
x <= 0/25
x <= 0
x in (0:+oo)
((e^1)/2)*ln(25*x) = 0
(e/2)*ln(25*x) = 0
(e/2)*ln(25*x) = 0 // : e/2
ln(25*x) = 0
ln(25*x) = ln(e^0)
25*x = e^0
25*x-e^0 = 0
25*x-1 = 0 // + 1
25*x = 1 // : 25
x = 1/25
x = 1/25
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