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giai giùm tớ bài này nhá
Cho [TEX]a,b,c>0[/TEX] CMR [TEX] {({a^2} + {b^2} + {c^2})^2} \ge ({a^3}b + {b^3}c + {c^3}a) [/TEX]
Cho [TEX]a,b,c>0[/TEX] CMR [TEX] {({a^2} + {b^2} + {c^2})^2} \ge ({a^3}b + {b^3}c + {c^3}a) [/TEX]