[tex]\displaystyle\bf\\\sqrt{2}\times\sqrt{5}\times\sqrt{8}\times\sqrt{20}=\\\\=\sqrt{2}\times\sqrt{8}\times\sqrt{5}\times\sqrt{20}=\\\\=\sqrt{2\times8}\times\sqrt{5\times20}=\\\\=\sqrt{16}\times\sqrt{100}=\\\\=4\times10=\\\\=\boxed{\bf40}\\\\Raspuns~corect:~~\boxed{\bf b)~~Cristian~~40}[/tex]
