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bella.vo21
2 năm trước
cho đường tròn C có phương trình $x^{2}$ + y2+4x+2y-1=0 và đường thẳng ​​Δ :3x-4y + 2020=0 a, xác định tâm I và bán kính C b, viết phương trình tiếp tuyến C .Biết rằng tiếp tuyến đó // với Δ
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