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1977北京文6
Author:
常振虎
GeoGebra
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畫出對稱圖形
近似值：有效數字
兩組對邊相等的四邊形
兩位數除以一位數（一）
【案例】2018年全国1卷理科12题
Discover Resources
waaachen
七巧板（tangram）
Exploration task
除法2
S3 Ch4.3 例4.6b 三視圖(3D圖)
Discover Topics
Sphere
Line Segment
Straight Lines
LCM and GCD
Limits