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1. nosnip

Are you sure the question is correct? Usually you have to find a common factor of all three surds, for example 5 goes into 5 and 20 but not 12. If you find a common factor then you simplify each surd so that they all say $x \sqrt{5}$ then just minus them from eachother.

2. anonymous

Yes the questionn is right @nosnip

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