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a03~x² + y² / 9 + z² / 4 = 1
Author:
黃斌
GeoGebra
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盈利與虧蝕
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第八周作业
常见四边形是否是双心四边形
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信賴區間
log and power funtion
科學記號與小數點的位移
費爾巴哈(Feuerbach)定理
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Choikou 5階
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Perimeter
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