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任务9：外凸的正方形
Author:
陈丽婷
GeoGebra
New Resources
第八周作业
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
四邊形的特性
sanjiaohanshu
Discover Resources
七彩之珠
歪斜線
Angle in alt.segment
向外延伸的多邊形
z=g(x,y)函数图像
Discover Topics
Arithmetic Mean
Solids or 3D Shapes
Mathematics
Stochastic Process or Random Process
Differential Equation