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2 năm trước
Cho góc vuông xOy,trên tia Ox lấy OA=4cm,trên tiaOy lấy OB=3cm,kẻ tia Bt vuông góc BA tại B,trên tia Bt lấy đoạn BD=6cm,kẻ DC vuông góc vs tia Oy.Tính độ dài các đoạn AB,BC,DC
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