`a) 3x=9`

`=>x=9 : 3`

`=>x=3`

`b) x^2=16`

`=>x^2=4^2`

TH`1` : `x=4`

TH`2` : `x=-4`

Vậy `x=4` hoặc `x=-4`

`c) 3-(x-2)^2=2`

`=>(x-2)^2=3-2`

`=>(x-2)^2=1`

`=>(x-2)^2=1^2`

TH`1` :

`=> x-2=1`

`=>x=1+2`

`=>x=3`

TH`2` :

`=> x-2=-1`

`=>x=-1+2`

`=>x=1`

Vậy `x=3` hoặc `x=1`

`d) 4^(x-1)+3*4^(x+1)=196`

`=>4^(x-1)*(1+3*16)=196`

`=>4^(x-1)*49=196`

`=>4^(x-1)=196 : 49`

`=>4^(x-1)=4`

`=>4^(x-1)=4^1`

`=>x-1=1`

`=>x=1+1`

`=>x=2`

`e) 3^(x+1)-54=3^x`

`=>3^(x+1)-3^x=54`

`=>3^x*(3-1)=54`

`=>3^x=54 : 2`

`=>3^x=27`

`=>3^x=3^3`

`=>x=3`

`f) 2^(2x+3) : 2^(x+1)=32`

`=>2^(2x+3-x-1)=32`

`=>2^(x-2)=32`

`=>2^(x-2)=2^5`

`=>x-2=5`

`=>x=5+2`

`=>x=7`

`g) (x-1)^3=(x-1)^2`

`=>(x-1)^3-(x-1)^2=0`

`=>(x-1)^2*(x-1-1)=0`

`=>(x-1)^2*(x-2)=0`

TH`1` : `(x-1)^2=0`

`=>x-1=0`

`=>x=1`

TH`1` : `x-2=0`

`=>x=2`

Vậy `x=1` hoặc `x=2`