Cho tam giác ABC ,góc A =90,AB=3cm,AC=4cm,lấy điểm D đối xứng vs B qua AC ,E đối xững vs C qua AB a,tứ giác BCDE là hình j b, gọi F là hình chiếu của E trên BC,BM là phân giác của góc FBE(M thuộc EF)chứng minh tam giác FBM đồng dạng tam giác ACB c,Tính FM

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