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第八周作业
四邉形 (四年級) 教師版
四邊形的特性
兩位數加法
異分母分數減法
Discover Resources
龍騰4_1-1講進4
圆锥曲线定义的拓展（卡西尼卵形线）
三次函數02
gjc102a19 三角形的對折
花瓣紋章
Discover Topics
Centroid or Barycenter
Poisson Distribution
Inequalities
Parallelogram
Pythagoras or Pythagorean Theorem