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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
(5/2)*p^2-(2/p) = 0
(5/2)*p^2-2*p^-1 = 0
5/2*p^2-2*p^-1 = 0
p^-1*(5/2*p^3-2) = 0
5/2*p^3 = 2 // : 5/2
p^3 = 4/5
p^3 = 4/5 // ^ 1/3
p = (4/5)^(1/3)
1/p = 0
1*p^-1 = 0 // : 1
p^-1 = 0
p należy do O
p = (4/5)^(1/3)
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