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phuongthao56
2 năm trước
Làm cho mình câu c. Cho hình chữ nhật ABCD, kẻ BH ⊥ AC tại H. Gọi E, F, G lần lượt là trung điểm của AH, BH và CD. a) Chứng minh tứ giác AEFB là hình thang. b) Chứng minh CF ⊥ EB. c) Gọi I là trung điểm của GB. Chứng minh ΔIEC cân.
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