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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)
2.24 = (1/x)^-1 // - (1/x)^-1
2.24-(1/x)^-1 = 0
2.24-x = 0 // - 2.24
-x = -2.24 // * -1
x = 2.24
x = 2.24
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