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14. Calculaţi: 5√2-√√3+7√5-4√3+√√2-6√5; c) 9√√2-4√7-√5-√7+8√5-4√2; b) 4√3-√√5-√6+8√3-4√6-7√5 d) √√6-√7-6√√5 +2√7+8√6-9√5​