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howtodo
2 năm trước
Cho tam giác ABC có AB = 4cm; AC = 6 cm; BC = 7 cm và đường phân giác trong AD. a) Tính độ dài các đoạn thẳng DB và DC. b) Từ D kẻ DE//AB ( E thuộc AC) Tính độ dài đoạn thẳng DE
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