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hanhhau79
2 năm trước
Cho góc xAy < 90 độ. Trên tia Ax lấy theo thứ tự hai điểm A, B. Từ B và C kẻ hai đường thẳng song song với nhau và cắt Ay ở D và E. Từ E vẽ đường thẳng song song với CD cắt Ax ở F. a) So sánh $\frac{AB}{AC}$ và $\frac{NB}{NC}$ b) Chứng minh rằng $AC^{2}$ = AB. AF
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