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OpenStudy (anonymous):
add 16sqrt27 + 2sqrt27
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OpenStudy (anonymous):
18sqrt27
jhonyy9 (jhonyy9):
but this is equal again 18*3sqrt3 =54sqrt3
jhonyy9 (jhonyy9):
because sqrt27=sqrt(9*3)=3sqrt3
OpenStudy (anonymous):
$$ 54 \sqrt{3}$$
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