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long10a1doican
2 năm trước
tổng tam giác ABC vuông tại A , AB=15 cm , AC=20 cm . Vẽ tia Ax//Bc vuông góc với BC tại B, Tia Ax cắt tia By tại D. a)C/minh tam giác ABC đồng dạng với tam giác DAB b) Tính BC,DA,DB c)AB cắt CD tại I . Tính diện tích tam giác BIC
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