1) (2x – 1/3)^3 2) (1/3x + 1)^3 3) 16 – 8x + x^2 4) x^3 – 6x + 12x – 8 Giúp Em với ạ

`1,(2x-1/3)³`

`=(2x)³- 3 . (2x)².1/3 + 3 . 2x . 1/3²-1/3³`

`=8 – 4x² + 2/9x-1/27`

`2,(1/3x + 1)³`

`=(1/3x)³ + 3.(1/3x)².1+ 3.(1/3x).1²+1³`

`=1/27+1/9x²+x+1`

`=28/7+1/9x²+x`

`3,16 – 8x + x^2`

`=4²-2.4.x+x²`

`=(4-x)²`

`4,x³ – 6x + 12x – 8`

`=x³-3.x².2+3.x.2²-2³`

`=(x-2)³`

Xin hay nhất !