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重难题组周练（1）——二次函数
Author:
程洁
Topic:
Quadratic Functions
GeoGebra
New Resources
兩組對邊相等的四邊形
兩位數加法
三位數除以一位數（一）
錐體建築師
拼砌四邊形
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winter vacation homework 6
Is this a prism 4
正十二面體內接正四面體旋轉
蝴蝶定理（唐老师的课程）
小学资源收集
Discover Topics
Kite
Rotation
Rational Numbers
Congruence
Vectors 2D (Two-Dimensional)