\(\left(\frac{1}{10}\right)^{30}=\frac{1}{10^{30}}=\frac{10^{10}}{10^{40}}\)
\(\left(\frac{3}{10}\right)^{40}=\frac{3^{40}}{10^{40}}\)
\(3^{40}=\left(3^4\right)^{10}=81^{10}\)
\(\Rightarrow3^{40}\)>\(10^{10}\)
\(\Rightarrow\left(\frac{3}{10}\right)^{40}\)>\(\left(\frac{1}{10}\right)^{30}\)