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2. Calculaţi: a) 5√12 +2√27; b) 2√63-5√28; = 5√2².3+2√3².3=10√3+6√3=16√3; b) 2√63-5√28 = 2√3²-7-5√2².7=6√7-10√7=-4√7; c) -√√18-3√√98 = -√√3²-2-3√7²-2=-3√√2-21√√2=-24√2. 3. Calculati: 7√√24-3./20 11.50 Soluție: a) 5√12+2√27 a no c) -√18-3√98.​