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 23/07/2021 Bởi Margaret 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 chúc bạn học tốt :))) Bình luận
`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 ! Bình luận
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
chúc bạn học tốt :)))
`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 !