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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
11/k = 121 // - 121
11/k-121 = 0
11*k^-1 = 121 // : 11
k^-1 = 11
-1 < 0
1/(k^1) = 11 // * k^1
1 = 11*k^1 // : 11
1/11 = k^1
k = 1/11
k = 1/11
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