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半圆的滚动
Author:
孟宝兴
GeoGebra
New Resources
兩位數加法
球體建築師
異分母分數減法
錐體建築師
球体的体积推导（优化版）
Discover Resources
clock
Trigonometric Ratios: Sine 三角比：正弦
ghseh 二次函數描點法上下平移-4
比較利益
绕圆旋转004
Discover Topics
Vectors
Isosceles Triangles
Rotation
Function Graph
Means