16) \(\dfrac{4^{22}\cdot5^{40}}{10^{41}}=\dfrac{\left(2^2\right)^{22}\cdot5^{40}}{\left(2\cdot5\right)^{41}}=\dfrac{2^{44}\cdot5^{40}}{2^{41}\cdot5^{41}}\)
\(=\dfrac{2^3}{5}=\dfrac{8}{5}\)
17)\(\dfrac{8^{17}\cdot15^{23}}{12^{25}\cdot25^{11}}=\dfrac{4^{17}\cdot2^{17}\cdot3^{23}\cdot5^{23}}{4^{25}\cdot3^{25}\cdot5^{22}}=\dfrac{2^{17}\cdot5}{4^7\cdot3^2}=\dfrac{2^3\cdot5}{9}=5\)
18)\(\dfrac{25^7\cdot2^{15}}{8^5\cdot5^{12}}=\dfrac{5^{14}\cdot8^5}{8^5\cdot5^{12}}=5^2=25\)
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