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angle 123
Author:
zhihuai1982
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數(一)
兩位數除以一位數(二)
【案例】2018年全国1卷理科12题
拼砌四邊形
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豆奶
平行線
圓周 (圖形D)
ghseh 二次函數動畫左右平移
初中数学教学素材
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Natural Numbers
Real Numbers
Similar Triangles
Upper and Lower Sum or Riemann Sum
Cuboid