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dthanhthao481
2 năm trước
cho tam giác ABC trung tuyến AD. Đường phận giác của góc ADB cắt cạnh AB ở M .đường phận giác của góc ADC cắt cạnh AC. Ở N /A) chứng minh rằng MN sống song với BC /b) gọi k là giáo điểm của AD và MN .chứng minh K là trung điểm của MN /c) chứng minh AM.AC-AB=0
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