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12 Calculați, utilizând formulele de calcul prescurtat: *(5√3-√5)-5√5-√12; € 28√3-(7-2√3): *(7√2-√5)+√8-√245; (√5-1) -√√5 (2√5 +2): 13 (√2-1)-2√2-(4√2-3); *5 (2√3-1)-10(√3-1)-√625; f b(√6-√3)+(2√2-3)(2√2+3); d (7√3+1)-28√6:√8; (3√6+4)-20√6-(√3)'. h (2√7-3) +2√7 (6-√7); 1(3√3-2√5) +60√30:(5√2); 1(2√6+1)-2√24-(√3). pls​