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異分母分數減法
【案例】圆柱体内放置一个大球六个小球
錐體建築師
畫出對稱圖形
三位數除以一位數（一）
Membuka sumber
总5第五题
Tangent from an external point
Copy of 作業-太極
学用数学（分季）
定理介紹：切線與半徑 | Tangent and Radius