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S12G4 長方形內夾正方形的周長問題
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学用数学
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兩位數加法
兩位數除以一位數(二)
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
找出對稱軸
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正切函數值的變化
等距共軛點(isotomic conjugate point)
分段函數
探究三角形的全等條件
y=Sin(x)伸縮平移
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