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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
11/t = 250 // - 250
11/t-250 = 0
11*t^-1 = 250 // : 11
t^-1 = 250/11
-1 < 0
1/(t^1) = 250/11 // * t^1
1 = 250/11*t^1 // : 250/11
11/250 = t^1
t = 11/250
t = 11/250
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