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  • 24-05-2024
  • Mathematics
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Cho 3 số thực a,b,c thỏa mãn a^2+b^2+c^2 nhỏ hơn hoặc bằng 2
a.Chứng minh a.c+b.c-a.b nhỏ hơn hoặc bằng 1

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