Question

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$a = 0.4 \times \sqrt{20} - \sqrt{4.05} + \frac{10 \div 2}{5}$
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Answer 1

$a = 0.4 \times \sqrt{20} - \sqrt{4.05} + \frac{10 \div 2}{5}$

$a = \frac{4}{10} \times2 \sqrt{5} - \frac{9 \sqrt{5} }{10} + \frac{5}{5}$

$a = \frac{4 \sqrt{5} }{5} - \frac{9 \sqrt{5} }{10} + 1$

$a = \frac{8 \sqrt{5} - 9 \sqrt{5} }{10} + 1$

$a = \frac{ - \sqrt{5} }{10} + 1$

$a = \frac{10 - \sqrt{5} }{10}$