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14. Calculati: a) 5√2-7√3+8√2+9√3; c) 7√5-2√3-8√5 +4√3; 0) 2√5+9√7-6√5-16√/7; b) 8√2+6√5+2√2-9√5; d) 4√3-2√7-11√7+8√3; 1) 3√7+11√2-13√7-8√2.​

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