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hiengo
2 năm trước
cho hình chữ nhật ABCD, AB=8cm, AD=6cm.Kẻ AM vuông góc với BD (m thuộc BD) a) Chứng minh tam giác ABD đồng dạng với tam giác MAD. Tính DM ??? b) đường thẳng AM cắt đường thẳng DC và BC theo thứ tự tại N và P. Chứng minh: AM^2=MN.MP c) Lấy E trên cạnh AB, F trên cạnh BC, EF cắt BD tại K.CM: AB/BE + BC/BF = BD/BK CÁC PẠN LÀM HỘ MK CÂU C VS MAI MK KTRA RỒI
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