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a) 3√2 - 5√8 + 2√20

b) ( [tex]\frac{1}{3 + √5}[/tex] - [tex]\frac{1}{3 - √5}[/tex]) : √5

c) √48 - √5[tex]\frac{1}{3}[/tex] - 2√75 - 5√1[tex]\frac{1}{3}[/tex]