Công thức tính khoảng cách từ gốc tọa độ đến đường thẳng y=ax b

Chứng minh rằng khoảng cách từ gốc tọa độ O đến đường thẳng \((d) : ax + by + c = 0\) được tính theo công thức : \(h = \frac{ |c|}{\sqrt{ a^2 + b^2}}\).

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