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m eR, m(m-2)+3=0, m=?

Răspuns :

m(m-2)-3=0
m^2-2m-3=0
m^2-3m+m-3=0
m(m-3)+(m-3)=0
(m+1)(m-3)=0
m+1=0 m=-1
m-3=0 m=3