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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
(3/2)*f^2-(7/f) = 0
(3/2)*f^2-7*f^-1 = 0
3/2*f^2-7*f^-1 = 0
f^-1*(3/2*f^3-7) = 0
3/2*f^3 = 7 // : 3/2
f^3 = 14/3
f^3 = 14/3 // ^ 1/3
f = (14/3)^(1/3)
1/f = 0
1*f^-1 = 0 // : 1
f^-1 = 0
f naleu017Cy do O
f = (14/3)^(1/3)
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