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1985全国理8
Author:
常振虎
GeoGebra
New Resources
錐體建築師
兩位數加法
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
畫出對稱圖形
Discover Resources
An angle problem
半圓柱(可改底面圓半徑、柱高)
立體圖
Riemann sum of double integral
兩直線的銳夾角
Discover Topics
Upper and Lower Sum or Riemann Sum
Fractions
Difference and Slope
Algebra
Interest Calculation