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chuquyk15
2 năm trước
Cho tam giác ace có ac=11cm lấy điểm b trên cạnh ac sao cho bc=6cm. lấy điểm d trên cạnh ae sao cho bd song song với ec giả sử ae+ed=25,5cm hãy tính a)tỉ số của2 đoạn thẳng de và ae b)độ dài các đoạn thẳng ae, de và ad
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