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驗證光的折射
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陳頤
GeoGebra
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平行線的斜率
球体的体积推导(优化版)
兩位數除以一位數(二)
【案例】2018年全国1卷理科12题
探究三角形的全等條件
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垂直平分線
三角函數
Volume of pyramid from triangular prism
单晨答重庆李琳
拋物線3--平行四邊形法
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Percentages
Area
Mode
Linear Functions
Similar Triangles