Вычисли

1. \((\sqrt{225})^2=\) [ ].
2. \((\sqrt{1,69})^2=\) [ ].
3. \(5-\sqrt{36}=\) [ ].
4. \(4+2\sqrt{49}=\) [ ].
5. \(3\cdot \sqrt{0,64}=\) [ ].
6. \(6:\sqrt{2,25}=\) [ ].