[tex]\Large\boxed{\begin{array}{l}\sf0,5=\dfrac{5\div5}{10\div5}=\dfrac{1}{2}\\\\\sf 16^{0,5}=16^{\frac{1}{2}}=\sqrt{16}=4\\\sf \sqrt{400}=20\\\sf\sqrt{400}-16^{0,5}=20-4=16\checkmark\end{array}}[/tex]
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[tex]\Large\boxed{\begin{array}{l}\sf0,5=\dfrac{5\div5}{10\div5}=\dfrac{1}{2}\\\\\sf 16^{0,5}=16^{\frac{1}{2}}=\sqrt{16}=4\\\sf \sqrt{400}=20\\\sf\sqrt{400}-16^{0,5}=20-4=16\checkmark\end{array}}[/tex]