[tex] \sqrt{25 \times 144} = \sqrt{25} \times \sqrt{144} = 5 \times 12 = 60. \\ \sqrt{256 \div 36} = \sqrt{256} \div \sqrt{36} = 16 \div 6 = \frac{8}{3} . \\ \frac{ \sqrt{144} }{ \sqrt{121} } = \frac{12}{11} . \\ \frac{ \sqrt{625} }{15} = \frac{25}{15} = \frac{5}{3} . \\ \sqrt{120 + 105} = \sqrt{225} = 15. \\ \sqrt{840 - 440} = \sqrt{400} = 20.[/tex]
