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12-6-2-多普勒效应2-波源静止，观察者运动-尤景汉
Author:
王翚
GeoGebra
New Resources
三位數除以一位數（一）
畫出對稱圖形
兩組對邊相等的四邊形
兩位數加法
兩位數除以一位數（二）
Discover Resources
Vector in R2
拼貼2
李樂雯_尋找PI的活動
實數相乘相加的幾何意義(數線上)
中國火柴遊戲二的副本
Discover Topics
Rational Numbers
Linear Programming or Linear Optimization
Linear Equations
Exponent
Cosine