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uyen27102002
2 năm trước
cho hình vuông ABCD có cạnh bằng 12 cm. a) Tính diện tích ABCD b) E di chuyển trên AD sao cho diện tích ABE bằng 1/3 diện tích ABCD. Tính AE c) BE cắt AD tại F. Tính diện tích ADF d) Lấy I thuộc CD sao cho góc EBI bằng 45 độ. Tính diện tích BIE e) cmr E di chuyển trên AD thì 1/BE^2+1/BD^2 không đổi
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