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tiendat23032002
2 năm trước
Cho tam giác abc, phân giác AD. gọi E và F lần lượt là hình chiếu của B và C lên AD. Chứng minh tam giác ABC đồng dạng tam giác ACF. b) biết AB = 7 cm ,AC = 9 cm, BC = 13 cm .Tính BD DC C ) Chứng minh AE x BF = AF x DE
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