15. *Cho hình bình hành ABCD, Ab là góc nhọn, AC cắt BD tại O, DE ⊥ AB tại E, DF ⊥ BC
tại F.
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Mathematics, 23.07.2021 14:00 carson5238
15. *Cho hình bình hành ABCD, Ab là góc nhọn, AC cắt BD tại O, DE ⊥ AB tại E, DF ⊥ BC
tại F.
(a) Chứng minh rằng tam giác FOE cân
(b) Giả sử BAD [ = m. Tính EOF [theo m.
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