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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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【案例】2018年全国1卷理科12题
三位數除以一位數（一）
判斷球體
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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