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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2+20/x = 0
x^2+20*x^-1 = 0
x^-1*(x^3+20) = 0
1*x^3 = -20 // : 1
x^3 = -20
x^3 = -20 // ^ 1/3
x = -20^(1/3)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x = -20^(1/3)
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