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tinsnake2003
2 năm trước
em vote câu trả lời hay nhất nhé mọi người... cho tam giác abc, 2 đường cao bh và ck cắt nhau tại e, qua b kẻ BX vuông góc ab; qua C kẻ cy vuông góc tại Ac. hai đường thẳng bx và cy cắt nhau tại d a. chứng minh ah.ac=ak.ab
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