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D( x )
x^0 = 0
x = 0
((((((x^1)/2)*y^-3)/5)/(x^0))*y^-2)/5 = 0
x^0 = 0
x^0 = 0
1 = 0
x^0 = 0
1 = 0
x belongs to the empty set
x = 0
x = 0
((((((x^1)/2)*y^-3)/5)/(x^0))*y^-2)/5 = 0
((((((x^1)/2)*y^-3)/5)/(x^0))*y^-2)/5 = 0
((((x/2)*y^-3)/5)*y^-2)/5 = 0
1/50*x*y^-5 = 0 // : 1/50*y^-5
x = 0
x in (-oo:0) U (0:+oo)
(((((((x^1)/2)*y^-3)/5)/(x^0))*y^-2)/5)^-5 = 0
(((((x/2)*y^-3)/5)*y^-2)/5)^-5 = 0
312500000*x^-5*y^25 = 0 // : 312500000*y^25
x^-5 = 0
x należy do O
x belongs to the empty set
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