giup mik vs Tim x: a, (2x-1)^3=125 b,3^x-1=27 c,26x:4=32 d,3^x:3^2=243 e,6x^3-8=40 h,4^2x-1:4=16

a, `(2x-1)^3`=125

=> `(2x-1)^3` = `5^3`

=> 2x-1 = 5

=> 2x = 6

=> x = 3

b,`3^(x-1)`=27

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

=> x – 1 = 3

=> x = 4

c,26x : 4=32

=> 26x = 128

=> x = `128/26`

=> x = `64/13`

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

=> 3^(x-2) = `3^5`

=> x – 2 = 5

=> x = 7

e,6`x^3` – 8=40

=>6`x^3` = 48

=> `x^3` = 8

=> `x^3` = `2^3`

=> x = 2

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

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

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

=> 2x – 1 = 3

=> 2x = 4

=> x = 2

XIN HAY NHẤT Ạ