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12. Calculaţi: a) (√2+√3)² + (√√2-√√3)²; (2√√2-√6)²+(4+√3)² c) 13. Calculaţi: a) (√3+√5x)²-(√15x-2)²; c) (2√√2x-√3)²+(√2+2√3x)²; 1)(√2+√5)²-(√2-√√5)²; (3√3-√√6)²-(9-√2)². (3-√14x)²-(√7x+√2)²; (√5x+4√2)²-(3√2x-√5)²​

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