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(-2013)compus(-2012)compus ....compus (-2).  xcompus cuy =(x+2)(y+2)-2




  Problema de lliceu



Răspuns :

x compus y=(x+2)(y+2)-2
=> -2 este element absorbant
*-compus
Deci (-2013) *(-2012)*...(-2)
Notam a (-2013)*(-2012)*...(-3)
a*(-2)=(a+2)(-2+2)-2=-2