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2 năm trước
Câu hỏi: Cho ABCD là hình bình hành có AB lớn hơn AD, AB vuông góc BC gọi E là điểm đối xứng với D qua A, EC cắt AC tại M. a) Chứng minh: M là trung điểm của EC ? b) Tứ giác ACBE là hình gì ? Chứng minh. Mọi người làm nhanh nhé, mình không còn nhiều thời gian đâu
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