[tex] \sqrt{2* 0,18} = \sqrt{0,36} =0,6[/tex]
[tex] \sqrt{3/4 *3/25} = \sqrt{9/100} =3/10
[/tex]
[tex] \sqrt{3 \sqrt{8}* 3\sqrt{8} } = \sqrt{3*3*8} = \sqrt{72} =6 \sqrt{2} [/tex]
[tex] \sqrt{ \sqrt{240} * 9\sqrt{15} } = \sqrt{ \sqrt{240*81*15} } = \sqrt{ \sqrt{291600} } = \sqrt{540} =6 \sqrt{15} [/tex]