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    id: 41950817
  • slide rule being used for calculation
    id: 30026004
  • Functions
    id: 29201556
  • Mathematics
    id: 22131548
  • Trigonometry - maths background
    id: 123485087
  • Leibniz wheel and counting wheel
    id: 73234657
  • Friedrich Bessel, German mathematician
    id: 56991377
  • Geometrical diagram with geometry set
    id: 27488673
  • Practice the multiplication table with a pencil
    id: 24301233
  • Number of combinations
    id: 236420128
  • Little school children and mathematical formulas on grey background
    id: 216417927
  • Science concept
    id: 163011245
  • GREECE - 2013: shows Plato mathematics maths geometry law book
    id: 84313240
  • Math
    id: 30019050
  • Variabili
    id: 17014669
  • Crumpled mathematics
    id: 107991812
  • numbers on a distance conversion chart
    id: 18901816
  • 勉強
    id: 68556472
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    id: 11832799
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    id: 48512374