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tan90
GeoGebra
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兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
判斷球體
【案例】2013年安徽高考15题
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正方變十字
圖示初小乘數
平行四邊形面積
单晨制作ggb绘图广东文老师供题
圓與切線
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Set Theory
Linear Equations
Combinatorics
Ratios
Curve Sketching