Chọn đẳng thức sai: \(\Large (x-1)^3+2(x-1)^2=(x-1)^2(x+1)\) \(\Large

Chọn đẳng thức sai:

• A.

  \(\Large (x-1)^3+2(x-1)^2=(x-1)^2(x+1)\)

• B.

  \(\Large {(x - 1)^3} + 2(x - 1) = (x - 1)\left[ {{{(x - 1)}^2} + 2} \right]\)

• C.

  \(\Large {(x - 1)^3} + 2{(x - 1)^2} = (x - 1)\left[ {{{(x - 1)}^2} + 2x - 2} \right]\)

• D.

  \(\Large (x-1)^3+2(x-1)^2=(x-1)(x+3)\)

Ta có \(\Large (x-1)^3+2(x-1)^2=(x-1)^2(x-1+2)=(x-1)^2(x+1)\ne(x-1)(x+3)\)