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vuthuthuy1902
2 năm trước
. Cho hình thang ABCD có A ,D = = 90 độ , AB = 2,4cm; BD = 4,8 cm; CD = 9,6 cm. a) Chứng minh rằng ABD đồng dạng BDC. b) Tính độ dài cạnh BC.
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