Question

\(a,\left(x-\dfrac{2}{9}\right)^3=\left(\dfrac{8}{27}\right)^3\)

\(b,\dfrac{x-1}{x+2}=\dfrac{4}{5}\left(x\ne-2\right)\)

\(c,64:\left(\dfrac{2}{3}-x\right)^3=\left(\dfrac{2}{3}-x\right):4\)

Answer 1

`a, = x - 2/9 = 2/3`

`=> x = 2/9 + 2/3`

`= 10/9`.

`b, 5x - 5 = 4x + 4`

`=> x = 9`.

`c, => 256 = (2/3-x)^4`

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

`-> x = 4 - 2/3`

`=> x = 10/3`

Answer 2

a: =>x-2/9=8/27

=>x=8/27+6/27=14/27

b: \(\Leftrightarrow5x-5=4x+8\)

=>x=13

c: \(\Leftrightarrow\left(\dfrac{2}{3}-x\right)^4=64\cdot4=256\)

=>2/3-x=4 hoặc 2/3-x=-4

=>x=2/3-4=-10/3 hoặc x=14/3