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ntlanh2911
2 năm trước
3,0 diểm) Cho AABC vuông tại A, đường cao AH. Biết AB = c, AC= b Giải tam giác ABC (góc làm tròn đến độ), với c=3cm và b = 4cm. - Từ H kẻ HM, HN lần lượt vuông góc với AB, AC tại M và N. BM a) Tính tỷ số BM/CN theo b, c. CN b) Chứng minh MN ^3= BM.CN.BC. MN ƠI MN CHỈ CẦN GIÚP MK CÂU b phần 2 thôi nhé. I luv u
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