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Bài 2. Tiết 1

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  • 14 - 5 =
    9
  • 11 - 8 =
    3
  • 16 - 8 =
    8
  • 17 - 8 =
    9
  • 12 - 4 =
    8
  • 12 - 7 =
    5
  • 11 - 6 =
    5
  • 15 - 7 =
    8
  • 17 - 8 =
    9
  • 15 - 7 =
    8
  • 18 - 9 =
    9
  • 13 - 8 =
    5
  • 18 - 9 =
    9
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