Giúp mình với :(((((

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Bài `9:`

`a, 5^200 : 5^13`

`=5^(200-13)`

`=5^187`

`b, 7^2001 : 7`

`=7^(2001-1)`

`=7^2000`

`c, 16^137 : 4^2`

`=16^137 : 16`

`=16^136`

`d, (2^48 . 2^5) : (2^3 . 2^17)`

`=2^53 : 2^20`

`=2^33`

`13.`

`a, 2^x : 8=32`

`2^x=256`

`2^x=2^8`

`x=8`

Vậy `x=8`

`b, 3^x : 3^2=243`

`3^x : 3^2 =3^5`

`3^x =3^5 . 3^2`

`3^x =3^7`

`x=7`

Vậy `x=7`

`c, 256 : 4^x =4^3`

`4^x =256 : 4^3`

`4^x =256 : 64`

`4^x =4`

`4^x =4^1`

`x=1`

Vậy `x=1`

`d, 5^x : 25=25`

`5^x =25 . 25`

`5^x =5^2 . 5^2`

`5^x =5^4`

`x=4`

Vậy `x=4`

`e, 5^(x+1) : 5=5^4`

`5^(x+1)=5^5`

`x+1=5`

`x=4`

Vậy `x=4`

`f, 4^(2x-1) : 4=16`

`4^(2x-1)=64`

`4^(2x-1)=4^3`

`2x-1=3`

`2x=4`

`x=2`

Vậy `x=2`