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youguys915
2 năm trước
Cho hình bình hành ABCD , đường thẳng d đi qua B cắt cạnh AD tại P và cắt cạnh CD kéo dài tại Q , cắt đường chéo AC tại E . CMR : a) EB^2 = EP.EQ ; b) Tính AP.CQ không phụ thuộc vào vị trí đường thẳng d
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