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立方体截面
Activity
myao1999
三棱锥截面
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myao1999
掷骰子
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myao1999
凹透镜
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myao1999
凸透镜成像
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myao1999
正弦曲线sin(x)
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myao1999
经纬度
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myao1999
极坐标
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myao1999
一次函数
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myao1999
直角坐标
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myao1999
月亮的轨道
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myao1999
向日葵
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myao1999
圆的面积 - 洋葱法
Activity
myao1999
圆的面积 - 排列组合法
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myao1999
