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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x-(5/2) = -1/2 // + -1/2
(2*x)/x-(5/2)-(-1/2) = 0
(2*x)/x-5/2+1/2 = 0
0 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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