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That depends on where the parentheses are in the question.

The square root of [ 27 - sqrt(12) ] is 4.8514 . (rounded)

sqrt(27) - sqrt(12) = 1.7321 . (rounded)

To get somewhat fancier about it . . .

sqrt(27) = 3 sqrt(3)

sqrt(12) = 2 sqrt(3)

sqrt(27) - sqrt(12) = sqrt(3) times (3 - 2) = 1 sqrt(3) = 1.732 (rounded)

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Q: What is the square root of 27 minus the square root of 12?
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