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= 4√5×3 - 3√5×5 + (2×4)√3×3 - (2×3)√3×5
= 4√15 - 3√25 + 8√9 - 6√15
= 4√15 - 6√15 - 3×5 + 8×3
= (4-6)√15 - 15 + 24
= -2√15 - 15 + 24
= -2√15 + 9