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Jawab :
(2√5)(2√5) + 3(2√5) - 3(2√5) - 3(3) =
4 x 5 + 3(2√5) - 3(2√5) - 9 =
20 - 9 = 11
= (2√5)² - 3²
= 20 - 9
= 11