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「15以內的減法算式」
Author:
man
GeoGebra
New Resources
Angle Addition Postulate (V2) - Integer Solutions
繪畫垂直線
Right Triangle Inscribed in a Semicircle
Midpoint Theorem (V2): Integer Solutions
Perpendicular Lines: Quick Exploration
Discover Resources
Triangular Prism
SPHN2017
การบวกจำนวนเต็ม
สามเหลี่ยมพีทาโกรัส
Kopija Polar coordinates (boat game)
Discover Topics
Upper and Lower Sum or Riemann Sum
Area
Parallelogram
Set Theory
Polygons