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cktsang
GeoGebra
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四邊形的特性
判斷球體
兩位數加法
異分母分數減法
球体的体积推导(优化版)
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圓內接四邊形 ABCD ...,求 sinθ=?
Prism
gjh-g03-01 和的平方公式
等比数列前n项和公式
test
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Inequalities
Logic
Multiplication
LCM and GCD
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