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Watch Later 15:04

一下ETV加法(一)

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五下ETV簡易方程(一)

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五下ETV棒形圖(二)

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四下A第十課同分母分數加法（第四堂）

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四下A第十課同分母分數加法（第五堂）

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四下A第十一課同分母分數減法（第一堂）

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