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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
3.6/k = 2/1.4 // - 2/1.4
3.6/k-(2/1.4) = 0
3.6/k-1.42857143 = 0
3.6*k^-1 = 1.42857143 // : 3.6
k^-1 = 0.3968254
-1 < 0
1/(k^1) = 0.3968254 // * k^1
1 = 0.3968254*k^1 // : 0.3968254
2.51999998 = k^1
k = 2.51999998
k = 2.51999998
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