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12. Calculați: a (7/(3sqrt(2)) + 1/(sqrt(2)) - 5/(2sqrt(2))) * (2sqrt(6))/5 : (8/(5sqrt(3)) - 3/(2sqrt(3)) + 1/(10sqrt(3))) / (4/(5sqrt(6))) : b) (5sqrt(14))/9 * (7/(5sqrt(2)) + 3/(2sqrt(2)) - 2/(sqrt(2))) ) (7/(2sqrt(3)) - 11/(4sqrt(3)) - 3/(8sqrt(3))) / (3/(4sqrt(15))) 20 S 21​

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