\(\left(2\sqrt{3}\right)^2=12< 18=\left(3\sqrt{2}\right)^2\Rightarrow2\sqrt{3}< 3\sqrt{2}\)
b/ \(\sqrt{24}+\sqrt{45}< \sqrt{25}+\sqrt{49}=5+7=12\)
\(\Rightarrow\sqrt{24}+\sqrt{45}< 12\)
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