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x²+y²+z²的取值范围
Author:
孟宝兴
GeoGebra
New Resources
兩位數加法
平行線的斜率
兩位數除以一位數（一）
兩位數除以一位數（二）
讀磅
Discover Resources
商高定理之正三角形1
Question 5
橢圓1--四圓心近似法
圓形方程 | Equations of Circles (Locus of a moving point from a fixed point)
直纹面单叶
Discover Topics
Algebra
Ellipse
Circumcircle or Circumscribed Circle
Secant Line or Secant
Combinatorics