`1.`
`x^n = 1 (n ∈ NN**)`
`=> x = 1`
`2.`
`x^n = 0 (n ∈ NN**)`
`=> x = 0`
`3.`
`x^n = 1 (n ∈ NN)`
`=>` \(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\)
`4.`
`x^2 = 9`
`=> x^2 = 3^2`
`=> x = 3`
`5,`
`3^x = 9`
`=> 3^x = 3^2`
`=> x = 2`
`6.`
`x^4 = 1`
`=> x = 1`
`7.`
`5^x = 25`
`=> 5^x = 5^2`
`=> x = 2`
`8.`
`5^x = 125`
`=> 5^x = 5^3`
`=> x = 3`
Vậy `x = 3`
`9.`
`2^x = 4`
`=> 2^x = 2^2`
`=> x = 2`
`10.`
`2^x = 8`
`=> 2^x = 2^3`
`=> x = 3`
`11.`
`2^x = 16`
`=> 2^x = 2^4`
`=> x = 4`
`12.`
`2^x = 2^2`
`=> x = 2`
`13.`
`2^x = 1`
`=> x = 0`
`14.`
`3^x = 81`
`=> 3^x = 3^4`
`=> x = 4`
`15.`
`3^x = 27`
`=> 3^x = 3^3`
`=> x = 3`
`16.`
`3^0 = x`
`=> 1 = x`
`=> x = 1`
`17.`
`x = 7^0`
`=> x = 1`
`18.`
`x^5 = 32`
`=> x^5 = 2^5`
`=> x = 2`
`19.`
`x^3 = 27`
`=> x^3 = 3^3`
`=> x = 3`
`20.`
`4^x = 64`
`=> 4^x = 4^3`
`=> x = 3`
