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linhkilllo1903
2 năm trước
Cho hbh ABCD , gọi M,N thứ tự là Tđ của BC và DC a, C/m BD = 2MN ; góc CMN = góc ADB b, AC cắt BD tại O; AN và AM cắt BD thứ tự tại E, F . C/m DE = EF = FB c, C/m chu vi tg AMN nhỏ hơn chu vi tg ABC
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