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證平行四邊形 (對邊相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
兩組對邊相等的四邊形
第八周作业
三位數除以一位數（一）
兩位數除以一位數（二）
異分母分數減法
Discover Resources
special
龍騰4_1-1習10
平行四邊形對角線
重複
Copy of 三角形的面積
Discover Topics
Expected Value
Dilation
Fractions
Parabola
Confidence Interval