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การบวกลบ คูณ หาร ร ...

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  • 500 – 300 + 20 × 20
    600
  • 20+100÷ 5 +60
    100
  • 200 ÷ 20 + 4 × 10
    50
  • 120 – 75 ÷ 15 + 66
    181
  • 55 + 50 ÷ 5 × 10
    155
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