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Trong video này, tôi muốn chúng ta
làm quen

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với số âm

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và cũng học một chút để làm sao ta
có thể cộng trừ số âm.

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Và khi bạn lần đầu tiên tiếp xúc
với chúng,

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Chúng có vẻ như lạ lẫm và thần bí.

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