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行程圖1
Author:
PGMS
GeoGebra
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錐體建築師
四邉形 (四年級) 教師版
sanjiaohanshu
柱體建築師
兩位數加法
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題3
任意四邊形１比３
q1: triangle with 3 equal part
-3 ≤ cosA+cosB+cosC ≤ 3/2
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