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Pentacle
Author:
Jianqiang He
GeoGebra
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兩組對邊相等的四邊形
兩位數除以一位數（一）
近似值：有效數字
【案例】2018年全国1卷理科12题
錐體建築師
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特別角的三角函數值(1)
Transit of Venus - Pentagram
共軛雙曲線
向日葵製作
中国节灯笼
Discover Topics
Rhombus
Difference and Slope
Expected Value
Linear Regression
Power Functions