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Divisibilidad entre 3 : Suma de cifras da 3 o múltiplo de 3
20.655 = 2+0+6+5+5= 18 (Múltiplo de 3)
20.655/3= 6.885
Saludos :)
-x³+x² ---------
-------------- x²-2
-2x+2
2x-2
------------------
0