[latex]| 4-\sqrt{11} | - |\sqrt{11}-3.5|[/latex]

I hope this helps you

[latex]| 4-\sqrt{11} | - |\sqrt{11}-3.5|=4- \sqrt{11}-(-( \sqrt{11} -3.5))=[/latex][latex]=4- \sqrt{11}+ \sqrt{11} -3.5=0.5[/latex] [latex]| 4-\sqrt{11} | =4- \sqrt{11} [/latex]  так как [latex]4\ \textgreater \ \sqrt{11} [/latex] [latex] |\sqrt{11}-3.5|=-( \sqrt{11}-3.5)=- \sqrt{11} +3.5[/latex]   так как [latex] \sqrt{11} \ \textless \ 3.5[/latex]