We have :
$$\sqrt{\ \frac{11025}{100}}\times\ \sqrt{\ \frac{1}{100}}\ \ \div\sqrt{\ 0.0025}-\sqrt{\ 420.25}$$
we will use BODMAS
and so we get $$10.5\times\ \frac{0.1}{0.05}-\sqrt{\ \frac{42025}{100}}$$
= 21-20.5
= 0.5
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