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phucxh008
2 năm trước
Cho tam giác ABC có M là trung điểm của BC và I là trung điểm của AC. Gọi N là điểm đối xứng với M qua I. a) Chứng minh tứ giác AMCN là hình bình hành. b) Chứng minh AB = MN. C. Gọi O là trung điểm của AM và D là giao điểm của CO và AB. Chứng minh rằng DB = 2AD.
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