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dieulinh01102006
2 năm trước
Cho các điểm A(1;2), B(-2;-1) và đường thẳng d: 3x-4y+2=0 1/ Viết phương trình đường tròn (C) đi qua điểm A và tiếp xúc với đường thẳng d tại điểm B. 2/ Viết phương trình tiếp tuyến với đường tròn (C) tại A.
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