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测试 = =
Author:
lanyi
bakaRu帮忙看看…… 你可以随意移动A和B两个点，A1和B1会自动移动
GeoGebra
New Resources
拼砌四邊形
【案例】2018年全国1卷理科12题
找出對稱軸
第八周作业
畫出對稱圖形
Discover Resources
constant function
滾動圓周來發現圓周長
Escher 階梯
定积分的概念（移动端）
S0S1 柱體與椎體
Discover Topics
Upper and Lower Sum or Riemann Sum
Vectors 2D (Two-Dimensional)
Arithmetic
General Quadrilateral
Cuboid