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Cálculo mental

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  • 4 x 6 - 4
    20
  • 75 + 12 - 7
    80
  • 3 x 3 + 12
    21
  • 32 + 50 - 12
    70
  • 85 - 15 + 50
    120
  • 7 x 2 - 13
    1
  • 2 x 5 + 14
    24
  • 100 + 18 - 15
    103
  • 16 + 84 - 35
    65
  • 56 + 27 - 3
    80
  • 25 + 30 - 22
    33
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