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拋物線2--焦點法
Author:
16楊杰
GeoGebra
New Resources
第八周作业
球体的体积推导（优化版）
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
拼砌四邊形
Discover Resources
三角形重心(相關說明)
angle between lines
優良作品1
Angle in Alternate Segment 2
圆与圆的位置关系
Discover Topics
Parametric Curves
Indefinite Integral
Trigonometry
Curve Sketching
Straight Lines