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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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兩位數除以一位數(一)
找出對稱軸
【案例】2018年全国1卷理科12题
異分母分數減法
四邊形的特性
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判斷錐體 2
四次函數圖形觀察
两平面夹角1
Ext angle cyclic quad
砍价
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