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phuongcute10062009
2 năm trước
Trong mặt phẳng toạ độ Oxy, đường thẳng ∆' là ảnh của đường thẳng ∆: 2x-y-5=0 qua phép tịnh tiến theo vectơ U=(4;-2). Tính khoảng cách từ góc toạ độ O tới đường thẳng∆'
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