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truongquan123ht
2 năm trước
Cho tam giác abc cân tại a. Qua b kẻ đường thẳng vuông góc với ac , qua C kẻ đường thẳng vuông góc với ab, chúng cắt nhau tại d. Chứng minh ad là tia pg của góc a Giúp giùm e ạ
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