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linatruong1307
2 năm trước
cho tam giác ABC có AB<AC.AM là tia phân giác của góc A(M thuộc BC).Trên cạnh AB lấy điểm E sao cho AE=AC.Gọi H là giao điểm các đường thẳng AC và ME C/M: a)MC=ME b)tam giác MCH=tam giácMEB c)AM vuông góc với HB d)MB>MC
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