To solve the expression, we will break it down step by step.
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First, calculate the square root of 81: \[ \sqrt{81} = 9 \]
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Next, calculate the product of -1 and -3: \[ -1 \times -3 = 3 \]
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Now, calculate the square root of 4: \[ \sqrt{4} = 2 \]
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Then, find the difference between the product of -1 and -3 and the square root of 4: \[ 3 - 2 = 1 \]
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Finally, divide the square root of 81 by the difference obtained: \[ \frac{9}{1} = 9 \]
Thus, the answer is \(9\).
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