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二次函数y=ax²（a＞0)
Author:
吕胜
GeoGebra
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異分母分數減法
兩位數除以一位數（一）
兩位數除以一位數（二）
近似值：有效數字
四邉形 (四年級) 教師版
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S5 Linear Programming
認識對稱圖形
說明用01
Angle at centre twice angle at circumference
分數比較
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Angles
Area
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Bar Chart or Bar Graph
Variance