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挑戰題2：兩重疊正方形面積
Author:
Erix Chen
GeoGebra
New Resources
異分母分數減法
四邉形 (四年級) 教師版
【案例】2018年全国1卷理科12题
兩位數加法
兩位數除以一位數（一）
Discover Resources
餘弦定理
七巧板
二元一次不等式
simulation of the uniform variable linear motion
(007)80102
Discover Topics
Trigonometric Functions
Logarithmic Functions
Numbers
Congruence
Prism