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tramngoc110201
2 năm trước
Cho tam giac ABC(AB《AC) có đg Cao AH.gọi M,N,K lần lượt là tđ của AB,AC,BC. a)C/m tứ giác BCMN Là h/thang b)C/m tứ giác AMKN là hình bình hành
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