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若隐若现的白点
Author:
许业成
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
【案例】2018年全国1卷理科12题
兩位數加法
柱體建築師
Discover Resources
Difference of Two Squares 平方差 (2)
Apollonius Problem gergonne
q5-8
閱讀月曆（綜合版）
旋轉菱形
Discover Topics
Division
Step Functions
Planes
Geometric Transformations
Upper and Lower Sum or Riemann Sum