Đáp án + Giải thích các bước giải:
$1)\quad (x-1)^3$
$= x^3-3x^2+3x-1$
$2)\quad (2x^2+3y)^3$
$= 8x^6+36x^4y+54x^2y^2+27y^3$
$3)\quad \left(x-\dfrac13\right)^3$
$= x^3-\dfrac13x^2+\dfrac13x-\dfrac1{27}$
$4)\quad \left(\dfrac12x-3\right)^3$
$= \dfrac18x^3-\dfrac4x^2+\dfrac{27}2x-27$
$5)\quad (x-3)^3$
$= x^3-9x^2+27x-27$
$6)\quad (2-3a)^3$
$4= 8-36a+54a^2-27a^3$$
$7)\quad (x+4)^3$
$= x^3+12x^2+48x+64$
$8)\quad (2y-5)^3$
$=8y^3-60y^2+150y-125$
