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xuangiaonguyen.04032004
2 năm trước
bài 1 cho tam giác ABC hai đường trung tuyến AM và BN cắt nhau tại g diện tích tam giác ABC bằng 336 cm vuông tính diện tích tam giác ABC bài 2 cho tam giác ABC trên cạnh AB lấy điểm d sao cho BD = ba a trên cạnh BC lấy điểm e sao cho be = 4 BC gọi f là giao điểm của AE và CD chứng minh fd = fc , chứng minh diện tích tam giác ABC = 2diện tích AFB mình cần gấp
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