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lansophie0901
2 năm trước
cho tam giác abc có ab=6cm ac=8cm bc=10cm, có hai đường trung tuyền AM và BN. a)chứng minh tam giác abc vuông tại a. b) Qua C vẽ tia Cx vuông góc với AC. Tia Cx cắt tia AM tạiD. Chứng minh AB=DC. c) Chứng minh tam gisc AMC cân d) Chứng minh AM+DN>3.MN * Lưu ý: Nhớ vẽ hình
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