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3√5 +⁴√25 - 2√45 - 3√20 =
3√5 + ⁴√5² - 2 √ 9*5 - 3√4*5 =
3√5 + ⁴/²√5²/² - 2*3√5 - 3*2√5 =
3√5 + √5 - 6√5 -6√5 =
4√5 -12√5 =
-8√5---> respuesta