`a)2^x*4=128`

`2^x=128/4`

`2^x=32`

`2^x=2^5`

`x=5`

 Vậy: `x=5`

`b)(2x+1)^3=125`

`(2x+1)^3=5^3`

`2x+1=5`

`2x=5-1`

`2x=4`

`x=4/2`

`x=2`

Vậy: `x=2`

`c)2x-2^6=6`

`2x=2^6+6`

`2x=64+6`

`2x=70`

`x=70/2`

`x=35`

Vậy: `x=35`

`d)64*4^x=45`

`4^x=45/64`

`x~~-0,25`

`e)27*3^x=243`

`3^x=243/27`

`3^x=9`

`3^x=3^2`

`x=2`

Vậy: `x=2`

`g)49*7^x=2401`

`7^x=2401/49`

`7^x=49`

`7^x=7^2`

`x=2`

Vậy: `x=2`

`h)3^x=81`

`3^x=3^4`

`x=4`

Vậy: `x=4`

`k)3^4*3^x=3^7`

`3^(x+4)=3^7`

`x+4=7`

`x=7-4`

`x=3`

Vậy: `x=3`

`n)3^x+25=26*2^2+2*3^0`

`3^x+25=26*4+2`

`3^x+25=104+2`

`3^x+25=106`

`3^x=106-25`

`3^x=81`

`3^x=3^4`

`x=4`

Vậy: `x=4`

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Mình nghĩ đề câu `d)` sai nên bạn có thể kt lại đề