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重难题组周练（1）——二次函数
Author:
程洁
Topic:
Quadratic Functions
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
【案例】2013年安徽高考15题
拼砌四邊形
四邉形 (四年級) 教師版
Discover Resources
電子幾何條
move
菱形
Logarithmic spiral
单晨整体迭代希尔伯特皮亚诺(HilbertPeano)
Discover Topics
Centroid or Barycenter
Matrices
Secant Line or Secant
Upper and Lower Sum or Riemann Sum
Perimeter