Đáp án:
Giải thích các bước giải:
$1.$
$a,(x+2)^2$
$b,(x-4)^2$
$c,x^2-25$
$d,(x+4)^3$
$e,(x-2)^3$
$f,x^3+8$
$g,x^3-27$
$h,(x+1)^2$
$i,(x-1)(x+1)$
$k,(x+3)^2$
$l,(2x-3)(2x+3)$
$m,(4x-1)^2$
$n,(3x+1)^2$
$o,(4x+2)^2$
$p,(x+3)(x^2-3x+9)$
$2.$
$a,4x^2+12xy+9y^2$
$b,25x^2-10xy+y^2$
$c,8x^3+12x^2y^2+6xy^4+y^6$
$d,x^4-\dfrac{4}{25}y^2$
$e,x^2+\dfrac{1}{2}x+\dfrac{1}{16}$
$f,\dfrac{8}{27}x^6-\dfrac{2}{3}x^4y + \dfrac{1}{2}x^2y^2-\dfrac{1}{8}y^3$
$g,27x^6-54x^4y+36x^2y^2-8y^3$
$h,x^3-27y^3$
$i,x^6-27$
$k,(x+2y)^2-z^2$
$=x^2+4xy+4y^2-z^2$
$l,8x^3-1$
$m,125+225x+135x^2+27x^3$
