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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2+6/x = 22/x // - 22/x
x^2+6/x-(22/x) = 0
x^2+6/x-22*x^-1 = 0
x^2-16*x^-1 = 0
x^-1*(x^3-16) = 0
1*x^3 = 16 // : 1
x^3 = 16
x^3 = 16 // ^ 1/3
x = 2*2^(1/3)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x = 2*2^(1/3)
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