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huynhvuluan2001
2 năm trước
Cho tam giác ABC cân tại C. Gọi D, E lần lượt là trung điểm của AC và BC. Các đường thẳng AE = BD cắt nhau tại M. Các đường thẳng CM, AB cắt nhau tại I. a, Chứng minh AE = BD b, Chứng minh DE // AB c, Chứng minh IM vuông với AB, từ đó tính IM trong trường hợp BC = 15cm, AB = 24cm
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