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= 3√9×10 + 5√2 ( √9×5 - 2√4×5
=3×3√10 + 5√2 (3√5 - 2×2√5)
= 9√10 + 5√2 (3√5 - 4√5)
=9√10 + 5√2 (-1√5)
=9√10 + (-5√10)
=4√10