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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
(3/7)*p^2-(4/p) = 0
(3/7)*p^2-4*p^-1 = 0
3/7*p^2-4*p^-1 = 0
p^-1*(3/7*p^3-4) = 0
3/7*p^3 = 4 // : 3/7
p^3 = 28/3
p^3 = 28/3 // ^ 1/3
p = (28/3)^(1/3)
1/p = 0
1*p^-1 = 0 // : 1
p^-1 = 0
p naleu017Cy do O
p = (28/3)^(1/3)
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