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光源距離 Light Source Distance
Author:
W.L. Wong, Albert
GeoGebra
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判斷球體
兩位數除以一位數(一)
四邉形 (四年級) 教師版
球體建築師
【案例】2018年全国1卷理科12题
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證平行四邊形 (對角相等)
three circle touching each other
减速传送带上的物体
正四角錐兩側面夾角
分数应用题——巧分烧饼
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Square
Tangent Function
Symmetry
Trapezoid
Sine