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3. Calculaţi a+b+c şi a-b+c, unde: a)a=2√3-√48+5√2-√18, b=3√2-√50-4√3+√108, c=6√2-√32-5√3+√27 ; b)a=3√5-√20-4√3+√12, b=7√3-√48-2√5 +√45, c=5√5-√27 +5√3-√20; c)a=√112-6√7-√108+5√3, b=√175-6√7-6√3+√192, c= √75-8√7-6√3+√112​