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mytram020801
2 năm trước
1. cho nửa đường tròn tâm o bán kính r đường kính ab và dây ac=r a) chứng minh tam giác ABC vuông và giải tam giác ABC b) gọi K là trung điểm của BC. Qua B vẽ tiếp tuyến Bx với (O), tiếp tuyến này cắt tia OK tại D. Chứng minh CD là tiếp tuyến của (O) 2. a) vẽ đồ thị hàm số: y=2x+3, có đồ thị là đường thẳng (d) b) tính khoảng cách từ gốc tọa độ O đến đường thẳng (d)
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