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Materia y números enteros

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  • -8 -4 = ? 5 - 9= ? (-5)·(-9) = ?
    -12 ; -9 ; +45
  • -3-5 = ?       5-8= ?      (-5)x4 = ? 
    -8. ;  -3  ;  -20 
  • -6 - 5 =? 4 - 7 = ? (-5)x(-5) = ?
    -11; -3 ; +25
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