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乘法计时训练
Author:
孟宝兴
Topic:
Multiplication
GeoGebra
New Resources
球体的体积推导（优化版）
画直线等分三角形的面积
四邊形的特性
三位數除以一位數（一）
拼砌四邊形
Discover Resources
仿生獸
矩陣
Pythagorean Triples 畢氏數組
第一个绘本
奔马
Discover Topics
Incircle or Inscribed Circle
Vectors 2D (Two-Dimensional)
Linear Equations
Rational Numbers
Secant Line or Secant