• គណិតវិទ្យា ថ្នាក់ទី៣ ទំនាក់ទំនងរវាងវិធីបូក និងវិធីដក
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  • 500 + 400= 900 ឬ 900 - ...........=500 ឬ 900 - ...........= 400
    ឬ 900 - 400 =500 ឬ 900 - 500 = 400
  • 600 + 200= 800 ឬ 800 - .........= 200 ឬ 800 - ........= 600
    ឬ 800 - 600 = 200 ឬ 800 - 200 = 600
  • ...... + 2 = 5 ឬ 5 - 2 = 3 ឬ 5 - .......= 2
    3 + 2 = 5 ឬ 5 - 2 = 3 ឬ 5 - 3 = 2
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