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tavbong0510
4 tháng trước

Cho hình chữ nhật ABCD có AB = 4cm, AD = 2cm. Gọi M là trung điểm của CD, N là trung điểm của BM. Tính độ dài đoạn thẳng DN?

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plu7972
4 tháng trước

Đáp án:

 

Giải thích các bước giải:

 

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