\(n^{150}< 5^{225}\)
\(\Rightarrow n^{150}=\left(n^2\right)^{75}\)
\(\Leftrightarrow\left(n^2\right)^{75}< \left(5^3\right)^{75}\)
\(\Rightarrow n^2< 125\)
\(\Rightarrow n< 12\)
\(\left|x-3,5\right|+\left|4,5-x\right|=0\)
\(\Rightarrow\left|x-3,5\right|=\left|4,5-x\right|\)
\(\Rightarrow x-3,5=4,5-x\)
\(\Rightarrow x+x=4,5+3,5\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=4\)