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二次函数与方程不等式的关系
Author:
zhusujuan
GeoGebra
New Resources
美國國旗 (Codex 版)
畫出對稱圖形
近似值：有效數字
長方體平面投影 (Codex版)
找出對稱軸
Discover Resources
Surface Integration
四角錐體
loci car
Doppler Effect and Shockwave
正方形纸片剪出正三角形（顶点在边上）
Discover Topics
Cosine
Exponential Functions
Arithmetic Operations
Surface
Matrices