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重难题组周练（1）——二次函数
Author:
程洁
Topic:
Quadratic Functions
GeoGebra
New Resources
異分母分數減法
【案例】2018年全国1卷理科12题
算柱 (兩位數)
兩位數除以一位數（一）
拼砌四邊形
Discover Resources
陳人瑜proof81
分數
How to draw an octagon with ruler and compasses?
雙曲線(上下型)標準式
繪畫四邊形
Discover Topics
Frequency Distribution
Vectors 3D (Three-Dimensional)
Arithmetic
Quadrilaterals
Secant Line or Secant