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- 3 √45 + 2 √20
- 3 √ ( 9 × 5 ) + 2 √ ( 4 × 5 )
- 3 ( √9 × √5 ) + 2 ( √4 × √5 )
- ( 3 × 3 √5 ) + ( 2 × 2 √ 5 )
- 9 √5 + 4 √ 5
- 5 √5 → Solución : 1)