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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x < 5*x // - 5*x
16/x-(5*x) < 0
16/x-5*x < 0
16*x^-1-5*x = 0
x^-1*(16-5*x^2) = 0
-5*x^2 = -16 // : -5
x^2 = 16/5
x^2 = 16/5 // ^ 1/2
abs(x) = (16/5)^(1/2)
x = (16/5)^(1/2) or x = -(16/5)^(1/2)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
(x-(16/5)^(1/2))*(x+(16/5)^(1/2)) < 0
(-oo:-(16/5)^(1/2)) (-(16/5)^(1/2):(16/5)^(1/2)) ((16/5)^(1/2):+oo) x-(16/5)^(1/2) - - + x+(16/5)^(1/2) - + +
x in (-(16/5)^(1/2):0) U (0:(16/5)^(1/2))
(-(16/5)^(1/2):0) U (0:(16/5)^(1/2))
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