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tugangster2
2 năm trước
Bài 1. Cho tam giác ABC. Đường phân giác của góc BAC cắt cạnh BC ở D, biết BD = 7,5cm, CD = 5cm. qua D kẻ đường thẳng song song với AB cắt cạnh AC ở E. -Tính AE, EC, DE nếu AC = 10cm Bài 2. Cho hình thang ABCD ( AB //CD). Đường thẳng d song song với AB, CD cắt các đoạn thẳng AD, BC, AC lần lượt tại M, N, K.’ Chứng minh: a) AM/AD = AK/AC b) AM/AD+CN/BC=1 (nếu có thêm hình thì càng tốt ak___mk sẽ vt 5 sao, cảm ơn )
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