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hongtrang1607
2 năm trước
Сau 1: (3d) Cho A DEF có DF = 10cm, góc E = 45°,góc F = 60°, đường cao DA. Tính DA; DE. Сau 2: (5d) Cho tam giác MHN vuông tại M, đường cao ME có MH= 5cm; MN = 12cm.. a) Tính HN; ME; số đo góc N (làm tròn đến phút) b) Kẻ EK vuông góc MH; EF vuông góc MN. Chứng minh MK.MH= MF.MN c) Chứng minh HE.EN = FK² d) Chứng minh : HK.HN = HE² Giải hộ 2 câu này với ạ
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