a=
[tex]2 \sqrt{2}(4 \sqrt{2 } - \frac{3}{2 \sqrt{2} } ) - ( \sqrt{3} + 4) + \frac{6}{ \sqrt{12} } [/tex]
b=
[tex](1 - \frac{1}{2})(1 - \frac{1}{3})(1 - \frac{1}{4})[/tex]