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D( x )
x = 0
1/x = 0
x = 0
x = 0
1/x = 0
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(4/1-(5*x))/(1/x) = 0
(4-5*x)/(1/x) = 0
(4-5*x)/(x^-1) = 0
4-5*x = 0 // - 4
-5*x = -4 // : -5
x = -4/(-5)
x = 4/5
x = 4/5
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