a)
[tex] \frac{4}{ \sqrt{2} } = \frac{4 \sqrt{2} }{2} = 2 \sqrt{2} [/tex]
b)
[tex] \frac{3}{2 \sqrt{2} } = \frac{3 \sqrt{2} }{2 \sqrt{4} } = \frac{3 \sqrt{2} }{4} = \frac{3}{4} \sqrt{2} [/tex]
c)
[tex] \frac{4}{ \sqrt{3} } = \frac{4 \sqrt{3} }{3} = 1 \frac{1}{3 } \sqrt{3} [/tex]
d)
[tex] \frac{6}{5 \sqrt{3} } = \frac{6 \sqrt{3} }{5 \sqrt{9} } = \frac{6 \sqrt{3} }{15} = \frac{6}{15} \sqrt{3} = \frac{2}{5} \sqrt{3} = 0.4 \sqrt{3} [/tex]