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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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兩位數除以一位數（一）
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
判斷球體
異分母分數減法
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全等三角形
橢圓
國旗動畫
Bayes' Thm
比較角的大小 一
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Hypothesis Testing
Polygons
Statistical Characteristics
Linear Regression
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