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異分母分數加法
Author:
whtong
GeoGebra
New Resources
画直线等分三角形的面积
兩位數加法
【案例】圆柱体内放置一个大球六个小球
拼砌四邊形
球体的体积推导（优化版）
Discover Resources
星球運動模擬
gjh-g04-01 差的平方公式
角的大小比較
BkD_act15_05c
P4_四下_面積（一）(教師版)
Discover Topics
Sine
Similar Triangles
Orthocenter
Statistical Characteristics
Symmetry