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圖C
Author:
whtong
GeoGebra
New Resources
垂直線的斜率
空间中两直线的位置关系
祖冲之的期望：内棋与外棋
盈利與虧蝕
双心四边形
Discover Resources
point uion coloring
分段2
夜市麻將模擬機
兔子繁殖树状图（斐波那契数列）
Copia de 分數除法5: x ÷ a/b (包含)
Discover Topics
Trapezium
Correlation
Rectangle
Stochastic Process or Random Process
Cuboid