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2 năm trước
Cho tam giác ΔABC, trung tuyến AM, BN cắt nhau tại G. Biết SGBM = 20 cm² . Trong các khẳng định sau, khẳng định nào sai: A. SBMN = 30 cm² B. SGAB = 30 cm² C. SBNC = 60 cm² D. SABC = 120 cm²
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