$\left(2^3\right)^4$  = .......

 $\left(5a\right)^0\ =\ ..........$  

 $4^3+4^3+4^3+4^3\ =..........$  

 $if\ 3^{x+1}=\ 5^{x+1},\ then\ x\ =\ .....$  

 $If\ \left(\frac{2}{3}\right)^9=\left(\frac{3}{2}\right)^x,\ then\ x\ =\ ........$