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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
拼砌四邊形
三位數除以一位數(一)
算柱 (兩位數)
GeoGebra笔记功能体验课件
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testing2
聯立方程式
congruent (SSS)