e)
[tex] \sqrt{20} + (3 \sqrt{10} ) \div (3 \sqrt{2} ) - \sqrt{5 } \\ \sqrt{20 } + \sqrt{5} - \sqrt{5 } \\ \sqrt{20} \\ 2 \sqrt{5} [/tex]
C)
[tex]3 \times ( \sqrt{20} + \sqrt{3} ) - \sqrt{3} \times ( \sqrt{5} + \sqrt{3} ) \\ 3 \times (2 \sqrt{5} + \sqrt{3} ) - \sqrt{15} - 3 \\ 6 \sqrt{5} + 3 \sqrt{3} - \sqrt{15} - 3[/tex]
