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thiennghitran22
2 năm trước
cho tam giác ABC có AB=a ,góc A=105°,Góc B=60°,trên cạnh BC lấy E sao cho BE =a vẽ ED //AB đường thẳng quá A vuông góc với AC cắt BC tại F gọi H là hình chiêú của A trên BC chứng minh tam giác ABE đều tính AH theo a
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