Cho parabol (P): y=x ²+mx+1. Tìm m sao cho ( P) là ảnh của (P'): y= -x ²-2x+1 qua phép tịnh tiến theo vectơ v=(0;1) A. m=1 B. m=-1 C. m=2 D. m= Ф mọi ng làm ơn giúp mk vs mình đang cần gấp

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