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А. 0.4 √80 \ √5 + 25 √0.45 \ √5 -9 √4\5 :√5 = 0.4 √16+ 25√0.09 - 9√4 =0.4 *4+ 25*0.3 - 9*2= 1.6+7.5-18= -8.9 б. ( √(0.2³)² *√((-3)² )² * √((-5)²)² ) \ 1*2 = 0.2³ *9 * 25 \ 2 = 0.1 * 9 * 25 = 22.5