Bài 1 : Cho hs : y= x2 + (2m+1)x + m2 -1 có đồ thị là (p)
a. CMR vs mọi m đt (p) luôn cắt đt y=m tại 2 điểm pbiệt 
b. CMR vs mọi m (p) luôn txúc vs 1 đường thẳng cố định . Xđịnh pt đthẳng đó 
Bài 2 : Cho họ (p) : y=x2 -mx+m . Hãy tìm quỹ tích của (p) khi m thay đổi

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