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知己
GeoGebra
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异形操场
龙形曲线-分形龙2
正方形雪花图案
第八周作业3
第八周作业1
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初中八年级奥数：面积与面积法
有向數
托勒密定理推廣到任意四邊形二
二次函數及其圖像2
动圆与两圆外切与内切(2)
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Means
Scalene Triangles
Area
Definite Integral
Statistical Characteristics