$\text{a)}5\sqrt{2}+1\approx 5\cdot 1,414213+1=7,071065+1=8,071065\approx 8,07$

$\text{b)}2-\sqrt{3}\approx 2-1,732050=0,26795\approx 0,27$  

$\text{c)}3\sqrt{5}+7\approx 3\cdot 2,236067+7=6,708201+7=13,708201\approx 13,71$  

$\text{d)}10\sqrt{13}+0,1\sqrt{17}\approx 10\cdot 3,605551-0,1\cdot 4,123105\approx 36,05551-0,4123105=35,6431995\approx 35,64$

$\text{e)}\frac{\sqrt{13}+\sqrt{2}}{2}\approx \frac{3,605551+1,414213}{2}=\frac{5,019764}{2}=2,509882\approx 2,51$

$\text{f)}\frac{\sqrt{17}-\sqrt{3}}{10}\approx \frac{4,123105-1,732050}{10}=\frac{2,391055}{10}=0,2391055\approx 0,24$