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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(m^2)/m-((3*m)/3) = 0
(m^2)/m-m = 0
0 = 0
m naleu017Cy do R
m in (-oo:0) U (0:+oo)
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