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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^2)/(x^3)-x^3 = 0
5*x^-1-x^3 = 0
x^-1*(5-x^4) = 0
-1*x^4 = -5 // : -1
x^4 = 5
x^4 = 5 // ^ 1/4
abs(x) = 5^(1/4)
x = 5^(1/4) or x = -5^(1/4)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 5^(1/4), -5^(1/4) }
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