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海龟爬行
Author:
赵林
GeoGebra
New Resources
算柱 (兩位數)
三位數除以一位數（一）
柱體建築師
【案例】2018年全国1卷理科12题
兩位數加法
Discover Resources
Catenoid
Transit of Venus - Pentagram
線性組合2： 三角形
等分旋轉
加法与乘法
Discover Topics
Optimization Problems
Ratios
Algebra
Cuboid
Combinatorics