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乘法1
Author:
chen mingchuan
GeoGebra
New Resources
算柱 (兩位數)
柱體建築師
第八周作业
兩位數除以一位數（二）
拼砌四邊形
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作業 分段函數
Orthocentre
特殊角三角函数值
拖拉小正方体
弦的垂直線何時平分弦活動?
Discover Topics
Incircle or Inscribed Circle
Scalene Triangles
Tangent Line or Tangent
Intersection
Exponent