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三角形面積(由面積求高)
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lkkbmaths teachers 檔案儲存用
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兩組對邊相等的四邊形
球体的体积推导
異分母分數減法
画直线等分三角形的面积
兩位數除以一位數（一）
Discover Resources
初心者的進化
Graph of Sine
構作對稱圖形
P4_四下_面積（一）(教師版)
直角坐标系与极坐标系的转换
Discover Topics
Parametric Curves
Trapezoid
Expected Value
Algebra
Integers