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ly5419935
2 năm trước
Cho tam giác ABC có AB=12cm;AC=15cm;BC=18cm. Trên cạnh AB đặt đoạn thẳng AM=10cm,trên cạnh AC đặt đoạn thẳng AN=8cm. Tính độ dài đoạn thẳng MN.
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