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2 năm trước
x^2-4x+2m=0 (x là ẩn ) tìm x1^2+x2^2-x1-x2=16 x^2-2mx+m-2=0 (x là ẩn số ) chứng minh rằng phương trình (1) luôn có 2 nghiệm phân biệt với mọi m
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