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Đáp án+Giải thích các bước giải:

`b)5x-2^3=3^3`

`=>5x-8=27`

`=>5x=35`

`=>x=7`

`to` Vậy `x=7` 

`e)20+5x=5^5 : 5^3`

`=>20+5x=5^2`

`=>20+5x=25`

`=>5x=5`

`=>x=1`

`to` Vậy `x=1`

`l)5x-201=2^4 . 4`

`=>5x-201=16.4`

`=>5x-201=64`

`=>5x=265`

`=>x=53`

`to` Vậy `x=53`

`p)4x-20=2^5 : 2^2`

`=>4x-20=2^3`

`=>4x-20=8`

`=>4x=28`

`=>x=7`

`to` Vậy `x=7`

`t)10+2x=4^5 :4^3`

`=>10+2x=4^2`

`=>10+2x=16`

`=>2x=6`

`=>x=3`

`to` Vậy `x=3`

`z)2x-138=2^3 . 3^2`

`=>2x-138=8.9`

`=>2x-138=72`

`=>2x=210`

`=>x=105`

`to` Vậy `x=155`

`k)x+18:3^2=5.4^2`

`=>x+18:9=5.16`

`=>x+18:9=80`

`=>x+2=80`

`=>x=78`

`to` Vậy `x=78`

`o)15+2x=3^80 : 3^77`

`=>15+2x=3^3`

`=>15+2x=27`

`=>2x=12`

`=>x=6`

`to` Vậy `x=6`