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nguyentuduc131001
2 năm trước
Cho $a,b,c$ không âm thỏa mãn $a+b+c=1$. Chứng minh rằng: $8(a^2+b^2+c^2)(a^2b^2+b^2c^2+c^2a^2+abc)\leqslant ab+bc+ca$
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