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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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【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
三位數除以一位數（二）
sanjiaohanshu
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Square
二次函數04
GGB3
Net of cone
鉛筆畫圓
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Cone
Geometry
Rational Numbers
Sphere
Median Line