WEBVTT

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Giá trị của số 3 trong 654.213 là bao nhiêu?

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Hãy cùng suy nghĩ về vấn đề này nhé

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Trước hết, tôi sẽ viết lại con số đó

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với mỗi chữ số là một màu khác nhau.

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Ta có 654.--, Và ta lấy phần thập phân --,213

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Bây giờ ta có

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