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tranthanhnhan201
2 năm trước
Bài ll. Cho tam giác ABC có diện tích bằng 240 cm². Lấy D là điểm chính giữa của canh BC, nối A với D. Lấy I là điểm chinh giữa của đoạn AD, nốiB với I kéo dài cắt AC tại K. a) Vẽ hinh và tính diện tich tam giác ABI, b) So sánh BI và IK.
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