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luuthithuhuong.a1.k55
2 năm trước
cho pt : x^3 + ax^2+bx+c=0, với a,b,c là các số thực thỏa mãn điều kiện 5a-b+11c=0. Chứng minh rằng phương trình trên luôn có ít nhất một nghiệm thuộc khoảng (-2;2)
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