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lenguyenthilinh91
2 năm trước
Cho tam giác ABCD có AB=2 cm, AC=4cm. Qua B dựng đg thg cắt đoạn thg AC tại D sao cho góc ABD= góc ACB. a, CM tam giác ABD đồng dạng với tam giác ACB b, tính AD, DC
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