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三角函数线
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GeoGebra
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【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
兩位數加法
画直线等分三角形的面积
異分母分數減法
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圓外切四邊形對邊和等長
S3 Percentages
Drag the red dots, see the area ratio of EHFG to ABCD
餘弦公式_1
四下_面積（一）(學生版)
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Frequency Distribution
Trigonometric Functions
Addition
Interest Calculation
Normal Distribution