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3. Calculați a+b+cşia-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​