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nguyenlambn
2 năm trước
Tam giác ABC có Ab=15cm,Ac=20cm Ac=25cm.Phân giác của BAC giao BC tại D.Qua D vẽ DE//AB a.Tính DB,DC,DEddddddddddd b.cm tam giác là tam giacds vuông.Tính dddđt tam giác ABC c.TÍnh diện tích tam giác ADC,di tam gics ADE,dt tam giác DCE
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