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翰林數學_2下_CH3-1_多邊形的內角和
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翰林數學
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三位數除以一位數（二）
異分母分數減法
畫出對稱圖形
拼砌四邊形
找出對稱軸
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雙曲線語橢圓
龍騰4_1-1課進9
點到直線距離-3 最短發生在垂直時
橢圓
y=Sin(x)伸縮平移