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9. Calculează: a) |1,4-√2; b) √3-1,7; c) 4-3√2-3√2; d) |1 -√2 + |2 -√2;
e) 5√2-4√3-16-3√3; f) |1 - √2 + √2-√3+√3-√4; g)
8-3√7+2√7+2-√7||.​