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b) ( 8-3√2)·√18= 8√18 - 3√36= 8√9·2 -3·6= 8·3√2 -18= 24√2 -18
c) ( 3√8 - √32) : √2= 3√8:√2 - √32: √2= 3√8:2 - √32:2= 3√4 -√16 =
3·2 - 4= 6-4=2