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Loga29999
2 năm trước
cho hình bình hành ABCD (AB>CD) lấy điểm M tùy ý trên cạnh AB, đoạn thẳng DM cắt AC tại K cắt BC tại N. a/c/m ΔADK đồng dạng ΔCNK b/ c/m DK^2 = KM.KN c/ cho AB = 10cm, AD = 9cm, AM = 6cm tính CN và tỉ số $\frac{SΔCKD}{SΔKAM}$ vẽ hình luôn nha
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