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WQS二分
Author:
lzy
GeoGebra
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常见四边形是否是双心四边形
盈利與虧蝕
第八周作业
科赫雪花
三角函数 的副本
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旋轉動畫
曲柄滑塊
ghseh 二次函數的開口大小
testing
拋物線3-平行四邊形法
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Trapezoid
Sine
Statistics
Perimeter
Pyramid