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minhtruong195
2 năm trước
Cho hình tam giác abc biết đáy b c bằng mười hai phẩy 5 cm kéo dài cạnh đáy bc trên đó lấy điểm mờ sao cho c l bằng 8 cm (hình vẽ) khi đó diện của hình tam giác a bê xê tăng thêm 24,8 cm2 tính diện tích hình tam giác abc
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