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longbinhquoitay7
2 năm trước
Trong mặt phẳng tọa độ Oxy, cho đường thẳng d: 3x+4y-9=0 và đường thẳng d': 3x+4y-4=0. Tìm phép tịnh tiến theo vecto v có phương vuông góc với d và biến d thành d'? A. v= (3/5;-4/5) B. v= (3/5;4/5) C. v=(4/5;3/5) D. v=(-4/5;3/5)
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