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it's for fun
Author:
dunst kang
it's for fun
GeoGebra
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四邉形 (四年級) 教師版
兩位數除以一位數（一）
【案例】2018年全国1卷理科12题
錐體建築師
兩組對邊相等和有直角的四邊形
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binary and hexadecimal
優良作品2(祥恩)
四年級_四邊形
用GGB制作奔驰轮胎.许兴华数学
蝴蝶定理（唐老师的课程）
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Fractions
Intersection
Coordinates
Area
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