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面积平分线
Author:
赵林
GeoGebra
New Resources
兩位數加法
兩組對邊相等和有直角的四邊形
拼砌四邊形
第八周作业
【案例】2018年全国1卷理科12题
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根據百分率找數量（一）:例1
angle between lines
體積的量度 2
圆的面积展开的副本
加減乘除运算 出题器【有数字键盘】
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Combinatorics
Triangles
Median Line
Reflection
Prism