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行列式計算平行四邊形面積
Author:
arist
平行四邊形面積
GeoGebra
New Resources
算柱 (兩位數)
sanjiaohanshu
三位數除以一位數（二）
四邊形的特性
拼砌四邊形
Discover Resources
滾出曲線滾出曲線
angles sum on a striaght line
gslsj 三角數列
法線 (The Normal Line)
一次函数经过象限操作
Discover Topics
Set Theory
Sine
Real Numbers
Quadrilaterals
Linear Programming or Linear Optimization