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二次函数y=ax²（a＞0)
Author:
吕胜
GeoGebra
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近似值：有效數字
判斷球體
異分母分數減法
sanjiaohanshu
算柱 (兩位數)
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比較角的大小
兩圓
S4 math
立體測量：兩仰角
羊角螺线[Euler spiral】
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Intersection
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Median Line
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