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Heron formula
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ralphchen
GeoGebra
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GeoGebra数学资源(4-8年级)
平行線的判定
椭圆内切圆链
中华人民共和国国旗
第八周作业
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奠基活動20141008
倒數計時
優良作品1(沛綺)
拋物線3--平行四邊形法
二倍角的正弦公式的证明
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Arithmetic Operations
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Tangent Function