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sumas y restas hasta el 20

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  • 5+7+5
    17
  • 14+2-5
    11
  • 20-5
    15
  • 14-8
    6
  • 4+4+6
    14
  • 12-8
    4
  • 5+8
    13
  • 11-6
    5
  • 13-7
    6
  • 6+7
    13
  • 9+7
    16
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