\(a,=2.2^4.2^3=2^8\\ b,=5^2.5.5^3=5^6\\ c,=\dfrac{2}{3}.\left(\dfrac{2}{3}\right)^2.\left(\dfrac{2}{3}\right)^3=\left(\dfrac{2}{3}\right)^6\)
\(2.16.8=2^1.2^4.2^3=2^{1+4+3}=2^8\)
\(25.5.125=5^2.5^1.5^3=5^{2+1+3}=5^6\)
\(\dfrac{2}{3}.\dfrac{4}{9}.\dfrac{8}{27}=\left(\dfrac{2}{3}\right)^1.\left(\dfrac{2}{3}\right)^2.\left(\dfrac{2}{3}\right)^3=\left(\dfrac{2}{3}\right)^{1+2+3}=\left(\dfrac{2}{3}\right)^6\)