Question

4 V18 112
$4 \sqrt{81 {?}^{2} }$
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Answer 1

$4 \sqrt{ {(81)}^{2} } \\ = 4 \sqrt{81 } \\ = 4 \sqrt{3 \times 3 \times 3 \times 3} \\ = 4 \times 3 \times 3 \\ = 36$

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