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正方形与内外弦图
Author:
方程
GeoGebra
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兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
画直线等分三角形的面积
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圖E
Drag the red dots, see the area ratio of EHFG to ABCD
Multiplication of Polynomials(多項式的乘法)
直線上的鄰角_1
双曲线定义
Discover Topics
Normal Distribution
Diagrams
Expected Value
Integers
Quadrilaterals