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sinα + sinβ > 0 ?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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【案例】2018年全国1卷理科12题
直角坐標平面上的旋轉變換
柱體建築師
三位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
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全等三角形: 重溫
双曲线
傅立葉級數
平行線法
Congruent Triangle (SSS)
Discover Topics
Geometric Mean
Sequences and Series
Matrices
Rhombus
Logarithm