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重难题组周练（1）——二次函数
Author:
程洁
Topic:
Quadratic Functions
GeoGebra
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判斷球體
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
柱體建築師
錐體建築師
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中心对称
垂直線的斜率_hui sir
gjh-e01-02 未知數邊長的長方形
標準分解式2
立方體的截平面
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Logic
Hypothesis Testing
Dilation
Mathematics
Complex Numbers