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AMO-Bench 2025 Problem 12

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Space vectors An→(xn,yn,zn)(1≤n≤2052)\overrightarrow{A_n}(x_{n}, y_{n}, z_{n}) (1 \leq n \leq 2052) satisfy that 1+xn,1+yn,1+zn(1≤n≤2052)\sqrt{1+x_{n}}, \sqrt{1+y_{n}}, \sqrt{1+z_{n}} (1 \leq n \leq 2052) are all real numbers, and ∑n=12052xn3=∑n=12052zn3=∑n=12052yn−2052=0,\sum_{n=1}^{2052} x_{n}^{3} = \sum_{n=1}^{2052} z_{n}^{3} = \sum_{n=1}^{2052} y_{n} - 2052 = 0, ∑n=120524zn=∑n=12052xn2=2736,∑n=12052yn2=4210703,∑n=12052yn3=8640361530.\sum_{n=1}^{2052} 4z_{n} = \sum_{n=1}^{2052} x_{n}^{2} = 2736, \sum_{n=1}^{2052} y_{n}^{2} = 4210703, \sum_{n=1}^{2052} y_{n}^{3} = 8640361530.

Find the maximum value of ∣A→1234∣∣A→432∣.\frac{\lvert \overrightarrow{A}_{1234}\rvert}{\lvert \overrightarrow{A}_{432}\rvert}.

Dataset text AMO-Bench. Open licence.

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\frac{3}{5} \cdot \sqrt{{4678570} + {2280}\sqrt{4210702}}

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