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6^12/3^11×4^5

6^12/3^11 × 4^5 = 6^12/3^5 × 4^5 × 3^6 = 6^12/12^5 × 3^6 = 6^12/6^5 × 2^5 × 3^6 = 6^7/2^5 × 3^6 = 6^7 /2^5 × 3^5 × 3 = 6^7/6^5 × 3 = 6^2/3 = (6 × 6)/3 = 2 × 6 = 12.