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足迹
Author:
孟宝兴
足迹
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（二）
探究三角形的全等條件
漂亮的摇摆曲线
【案例】2018年全国1卷理科12题
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平行四邊形面積教材四
乘法表的自动练习
Proofs Without Words
圆心角和圆周角
P53_3c
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Polygons
Symmetry
Line Segment
Exponent
Trapezoid