Question 312467
{{{sqrt(27)=sqrt(9*3)=3sqrt(3)}}}
{{{sqrt(8)=sqrt(4*2)=2*sqrt(2)}}}
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{{{sqrt(27)-sqrt(8)+2sqrt(2)=3sqrt(3)-2sqrt(2)+2sqrt(2)}}}
{{{sqrt(27)-sqrt(8)+2sqrt(2)=3sqrt(3)}}}
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a) is the correct answer.