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D( x )
x = 0
1/x = 0
x = 0
x = 0
1/x = 0
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in (-oo:0) U (0:+oo)
0.81 = 1/(1/x) // - 1/(1/x)
0.81-(1/(1/x)) = 0
0.81-x = 0
0.81-x = 0 // - 0.81
-x = -0.81 // * -1
x = 0.81
x = 0.81
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