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表内乘法
Author:
玖数
表内乘法
GeoGebra
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算柱 (兩位數)
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
四邊形的特性
【案例】2018年全国1卷理科12题
Discover Resources
十字交乘法
平行四邊形
Properties of a Parallelogram
小立方体组合的三视图【鼠标拖动法】
椭圆内反射
Discover Topics
Median Line
Mathematics
Secant Line or Secant
Vectors 2D (Two-Dimensional)
Ratios