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-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提:α + β + γ = 0
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兩組對邊相等的四邊形
兩位數除以一位數(一)
找出對稱軸
三位數除以一位數(二)
異分母分數減法
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在試算表中使用按鈕、下拉式選單、勾選框
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正立方體
example1_moon
立體圖形_截面
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