$$39852 \div \sqrt{?} = 81 \times 12$$
Expression : $$39852 \div \sqrt{?} = 81 \times 12$$
=> $$\frac{39852}{\sqrt{?}} = 81 \times 12$$
=> $$\sqrt{?} = \frac{39852}{81 \times 12}$$
=> $$? = 41^2 = 1681$$
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