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3 Calculați: a c √6 (3√5-2√5)-√2-√15; C √3.(2√5 +3√5)-√5 (√3+2√3); e 2√√3+3.4√3; Joulole: b 5√2-2√2.2; (4√2-√√2) √2+√√2.√18; 2. (√12-√3)+(√27-√√48)-3. L​