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Author:
chen mingchuan
GeoGebra
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兩位數除以一位數（二）
兩組對邊相等的四邊形
異分母分數減法
第八周作业
【案例】2018年全国1卷理科12题
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為甚麼二次函數中，a是正數，開口向上?
Ratio of angles at the centre and the length of the arcs.
直角三角形斜边上的中线
堆垛系列
S0E01 一次、二次函数的绘制
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Dilation
Geometric Distribution
Frequency Distribution
Line Segment
Incircle or Inscribed Circle