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anhtadiua2018
2 năm trước
Cho tam giác ABC và M là 1điểm thuộc cạnhh AB sao MA/MB = 2/3 a) Tính độ dài đoạn MA và MB biết AB=10cm. b) Điểm N thuộc cạnh AC sao cho AN=6cm , NC=9cm. Chứng minh: MN // BC. c) Cho BC=20cm. Tính độ dài đoạn MN. Em đang cần gấp, ai giải hộ em, em sẽ vote 5 sao cho ạ. Em cảm ơn. Nếu đc thì giải câu c) thôi ạ
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