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5(3) + 5(- 2√5) + √3(3) + √3(- 2√5)
15 - 10√5 + 3√3 - 2√15
3√3 - 10√5 - 2√15 + 15
↔ ( 5 × 3 ) + ( 5 × -2√5 ) + ( √3 × 3 ) + ( √3 × -2√5 )
→ 15 - 10√5 + 3√3 - 2√15