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winnie
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hwpctablet
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算柱 (兩位數)
画直线等分三角形的面积
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等的四邊形
第八周作业
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Graphs of Linear Equations in Two Unknowns 二元一次方程的圖像
pentagon
Orthographic views example
x^3+y^3-3xy
圖形C
Discover Topics
Upper and Lower Sum or Riemann Sum
Translation
Trigonometry
Derivative
Trigonometric Functions