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chanfushun
GeoGebra
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画直线等分三角形的面积
四邉形 (四年級) 教師版
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
異分母分數減法
Discover Resources
三個交點
S5 Permutation and Combination
HW1121505
rotational symmetry_1
加减乘除法综合
Discover Topics
Cube
Scalene Triangles
Scatter Plot
Fractal Geometry
Rotation