\[a = 3,5 \Longrightarrow \sqrt{3,5 - 3} = \sqrt{0,5} =\]
\[= 0,71\]
\[a = 5,2 \Longrightarrow \sqrt{5,2 - 3} = \sqrt{2,2} =\]
\[= 1,48\]
\[a = 26,8 \Longrightarrow \sqrt{26,8 - 3} =\]
\[= \sqrt{23,8} = 4,88\]
\[a = 588,6 \Longrightarrow \ \sqrt{588,6 - 3} =\]
\[= \sqrt{585,6} = 24,20\]