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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
132.5/x = x // - x
132.5/x-x = 0
132.5*x^-1-x = 0
x^-1*(132.5-x^2) = 0
-1*x^2 = -132.5 // : -1
x^2 = 132.5
x^2 = 132.5 // ^ 1/2
abs(x) = 132.5^(1/2)
x = 132.5^(1/2) or x = -132.5^(1/2)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 132.5^(1/2), -132.5^(1/2) }
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