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

Va Rog Ex 123 Sunt Diferite De Celelalte Plizzz class=

Răspuns :

[tex] \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} [/tex]




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