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= 5√5 + √25×5 - 3√4×5
= 5√5 + √25 × √5 - 3 ×√4 × √5
= 5√5 + 5 × √5 - 3 × 2 × √5
= 5√5 + 5√5 - 6√5
= (5+5-6)√5
= 4√5