Question

va rog ex 1,2,3 sunt diferite de celelalte plizzz

Answer 1

$\displaystyle\\ 1)\\ \sqrt{2} \cdot \sqrt{8}-3= \sqrt{2 \cdot 8}-3=\sqrt{16}-3=4-3=\boxed{\bf 1}\\\\ \text{Raspuns corect: }~\boxed{B}\\\\ 2)\\ M=\Big\{x\in R~\Big|~x<\sqrt{5}\Big\}\\\\ M \cap N^* = \Big\{n\in N^*~\Big|~n<\sqrt{5}\Big\} = \{1;~2\}\\\\ \Rightarrow~\boxed{\bf 2~ elemente}\\ \text{Raspuns corect: }~\boxed{A}\\\\ 3)\\ P = 9 + 12 + \sqrt{9^2+12^2} =21+\sqrt{81+144} =\\\\ =21+\sqrt{225} =21+15= \boxed{\bf 36~cm}\\\\ \text{Raspuns corect: }~\boxed{C}$