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兩位數的加減

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  • 46+4
    50
  • 55-8
    47
  • 25+25
    50
  • 42+15
    57
  • 26-23
    3
  • 43-6
    37
  • 39-6
    33
  • 16+18
    34
  • 15+36
    51
  • 22+33
    55
  • 68-5
    63
  • 36-16
    20
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