1) ( 2 √ 3 - 3 √ 2)^2 = ( √ 12 - √ 18 )^2 = 12 - 2√ 12√18 + 18 = 30 - 2 √ 216 =
= 30 - ( 2 * 2 * 3) √ 6 = 30 - 12 √ 6
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2) √ 24 * ( 6 - 5 √ 6) = 6 √ 24 - 5 √ 144 = 6 √ 24 - 5 * 12 = 6 √ 24 - 60 = 12 √ 6 - 60
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3) 30 - 12 √ 6 + 12 √ 6 - 60 = ( - 30 )