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Bài 3:

`1)`

`(x - 1/2)^3 = -8`

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

`x - 1/2 = -2`

`x = -2 + 1/2`

`x = -3/2`

`2)`

`(x - 1/2)^3 = 27/8`

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

`x - 1/2 = 3/2`

`x = 3/2 + 1/2`

`x = 2`

`3)`

`(x - 1/3)^3 = -8/27`

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

`x - 1/3 = -2/3`

`x = -2/3 + 1/3`

`x = -1/3`

`4)`

`(x - 1/3)^3 = 8/27`

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

`x - 1/3 = 2/3`

`x = 2/3 + 1/3`

`x = 1`

`5)`

`(x - 5/2)^3 = -1/8`

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

`x - 5/2 = -1/2`

`x = -1/2 + 5/2`

`x = 2`

`6)`

`(x - 1/8)^3 = -8/125`

`(x - 1/8)^3 = (-2/5)^3`

`x - 1/8 = -2/5`

`x = -2/5 + 1/8`

`x = -11/40`

`7)`

`(x + 1/2)^2 = 1/16`

`(x + 1/2)^2 = (1/4)^2`

`x + 1/2 = 1/4` hoặc `x + 1/2 = -1/4`

`x = 1/4 - 1/2` hoặc `x = -1/4 - 1/2`

`x = -1/4` hoặc `x = -3/4`

`8)`

`(x - 3/2)^2 = 9/16`

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

`x - 3/2 = 3/4` hoặc `x - 3/2 = -3/4`

`x = 3/4 + 3/2` hoặc `x = -3/4 + 3/2`

`x = 9/4` hoặc `x = 3/4`

`9)`

`(x - 5/6)^2 = 1/36`

`(x - 5/6)^2 = (1/6)^2`

`x - 5/6 = 1/6` hoặc `x - 5/6 = -1/6`

`x = 1/6 + 5/6` hoặc `x = -1/6 + 5/6`

`x = 1` hoặc `x = 2/3`

`10)`

`(x + 2/5)^2 = 9/16`

`(x + 2/5)^2 = (3/4)^2`

`x + 2/5 = 3/4` hoặc `x + 2/5 = -3/4`

`x = 3/4 - 2/5` hoặc `x = -3/4 - 2/5`

`x = 7/20` hoặc `x = -23/20`

`11)`

`(x + 1/12)^2 = 16/9`

`(x + 1/12)^2 = (4/3)^2`

`x + 1/12 = 4/3` hoặc `x + 1/12 = -4/3`

`x = 4/3 - 1/12` hoặc `x = -4/3 - 1/12`

`x = 5/4` hoặc `x = -17/12`

`12)`

`(x - 4/7)^2 = 1/49`

`(x - 4/7)^2 = (1/7)^2`

`x - 4/7 = 1/7` hoặc `x - 4/7 = -1/7`

`x = 1/7 + 4/7` hoặc `x = -1/7 + 4/7`

`x = 5/7` hoặc `x = 3/7`