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D( k )
(((2*k)^3)/10)*k^5 = 0
(((2*k)^3)/10)*k^5 = 0
(((2*k)^3)/10)*k^5 = 0
4/5*k^8 = 0 // : 4/5
k^8 = 0
k = 0
k in (-oo:0) U (0:+oo)
(((-5*k^2)/2)*k^5)/((((2*k)^3)/10)*k^5) = 0
-25/8*k^-1 = 0 // : -25/8
k^-1 = 0
k należy do O
k belongs to the empty set
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