Standard 5 · 数学 (Mathematics)

平均数

計算平均數時最常犯的錯誤就是遺漏了總和或忽略了數據為零的情況。只要你掌握了先求總和再進行除法的核心步驟，無論題目如何變換分數或數量都能輕鬆算出正確答案。

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