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Hoamieumieu10
2 năm trước
bài1. Cho hình chữ nhật ABCD có AB = 8,BC = 15 a.tính BD b. Kẻ AH vuông góc với BD cắt BC và CD lần lượt tại I và K.Chứng minh AH^2=HI.HK bài2. Cho tam giác CDE nhọn,đường cao CH.Gọi M,N theo thứ tự là hình chiếu của H trên CD và CE.Chứng minh: a.CD.CM=CE.CN b.tam giác CMN đồng dạng với tam giác CED bài3.tam giác ABC có 3 góc nhọn và AH vuông góc với BC a.chứng minh AB^2+CH^2=AC^2+BH^2 b.gọi M,N theo thứ tự là hình chiếu của H trên AB,AC chứng minh AM.AB=AN.AC giúp mình với mình cần trong tối nay:(
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