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= 5√9.√5 - √4.√5 + 12√5 - √9.√5
= 5.3√5 - 2√5 + 12√5 - 3√5
= 15√5 - 2√5 + 12√5 - 3√5
= 22√5
=5x3√5 - 2√5 +12√5 -2√5
=15√5-2√5+12√5-2√5
=23√5